Defendant’s first assignment of error concerns the court’s admission of the testimony of Betsy Pritchard, plaintiff’s wife, as to the reasons for placing the custody of the child with plaintiff. The record shows the following:
Q. Why do you think it would be better for the Court to allow the custody of Michael to be placed with his father?
A. Michael has always been closer to Joe. I think he can provide a happier home for him because that’s where Michael wants to live.
Defendant argues that this testimony is incompetent and highly prejudicial because the testimony went to the ultimate issue before the court.
We do not believe that the court’s admission of this testimony requires a new trial. Defendant correctly states the general rule that a witness may not give his opinion on the very question for decision. State v. Lindley, 286 N.C. 255, 210 S.E. 2d 207 (1974); Ponder v. Cobb, 257 N.C. 281, 126 S.E. 2d 67 (1962); Wood v. Insurance Co., 243 N.C. 158, 90 S.E. 2d 310 (1955). It is also apparent from the testimony quoted above that the question and answer assumed the very question before the court, i.e., whether plaintiff should be awarded custody of the child. However, without considering the admissibility of this evidence, we conclude that there is nothing in the record which affirmatively discloses that the court’s award was based, in whole or in part, on this particular testimony. Indeed, “[t]he presumption is to the contrary. In a nonjury trial, in the absence of words or conduct in*193dicating otherwise, the presumption is that the judge disregarded incompetent evidence in making his decision.” (Citations omitted.) City of Statesville v. Bowles, 278 N.C. 497, 502, 180 S.E. 2d 111, 114-15 (1971). Defendant’s first assignment of error is overruled.
 Defendant next argues that the trial court showed bias and prejudice against her in considering defendant’s offer of testimony by Tommy Hall concerning his conferences with defendant’s children. Defendant contends that the trial judge demonstrated his prejudice when, in response to defendant’s counsel’s offer to qualify Hall as an expert, he stated: “It’s up to you, I don’t care anything about it frankly.” We do not agree. On the contrary, by his statement, it is apparent that the trial judge reiterated his prior ruling on the admissibility of Hall’s testimony concerning the psychological condition of the two children at a particular point in time. The appellant’s counsel, apparently recognizing the fact that the witness had not been qualified as an expert, offered to qualify him “if the court wishes.” Whether to qualify the witness was obviously a decision for counsel, not the court. While the court’s remark may have been somewhat flippant, it does not, in our opinion, indicate prejudice toward defendant. There is nothing that indicates any impropriety on the judge’s part in ruling in this fashion. Additionally, defendant did not except to the court’s ruling on the admissibility of Hall’s testimony, nor did defendant provide in the record what the testimony would have been if Hall had been allowed to testify further. Defendant’s argument is, therefore, without merit.
 Defendant next argues that the court erred in concluding that there had been a material change of circumstances since the prior custody order justifying its award of the custody of Michael to plaintiff. We note in particular the following facts as found by the court in its order:
5. That during most of the 1977-1978 and 1978-1979 school year until the time of this hearing the said Michael John Pritchard has been residing with the plaintiff and has been enrolled in the public schools and making excellent academic progress and has been attending church; that the emotional state and condition of the said Joseph Michael Pritchard, the older child, has substantially improved since *194he and his brother have been living separate and apart since the spring of 1978.
6. The defendant is employed by Branch Banking and Trust Company on a full-time basis earning approximately $725.00 per month. The plaintiff is earning approximately $810.00 per month. The plaintiff’s wife is not employed, has no children of her own and is available to provide and care for said Michael John Pritchard on a full-time basis, in a comfortable and adequate home; that both children are happy, relaxed emotionally and better adjusted since the said Michael John Pritchard has been residing with the plaintiff; that there is mutual love and respect among Michael John Pritchard, the plaintiff and his wife, and that the environment in which Michael John Pritchard has been raised while with the plaintiff and his wife appears to the Court to be stable and to have been conducive and beneficial to the raising of said minor child.
7. That the plaintiff is a fit and proper person to have the care and custody of Michael John Pritchard and he and his wife are able to provide a two parent home and love and care for said child; that there has been a beneficial change in the mental and emotional state of well-being of at least one of the children since Michael John Pritchard has been residing with the plaintiff and that the welfare and best interest of the said Michael John Pritchard will be served by now vesting his custody in the plaintiff so that the said Michael John Pritchard will have both male and female supervision.
10. From the date of the prior Order of the Court while the defendant has had custody of Michael John Pritchard, said child has been subject to frequent transfers between the households of the plaintiff and defendant at the whim of the defendant and it would be in said minor child’s best interest to have a stable environment.
Based on these findings, the court ruled that “there has been a sufficient, substantial and material change of circumstances as defined by N.C.G.S. 5043.7(a) since the entry of this Order of October 1, 1975” to warrant a change of custody.
*195G.S. 50-13.7(a) provided, at all times pertinent to this case, that “[a]n order of a court of this State for custody or support, or both, of a minor child may be modified or vacated at any time, upon motion in the cause and a showing of changed circumstances by either party or anyone interested.” In Tucker v. Tucker, 288 N.C. 81, 216 S.E. 2d 1 (1975), our Supreme Court stated the rules applying to a modification of a custody decree:
An order pertaining to the custody of the child does not finally determine the rights of parties as to the custody, care and control of a child, and when a substantial change of condition affecting the child’s welfare is properly established, the court may modify prior custody decrees. G.S. 50-13.7. Blackley v. Blackley, [285 N.C. 358, 204 S.E. 2d 678 (1974)]; Teague v. Teague, 272 N.C. 134, 157 S.E. 2d 649 (1967); In re Herring, 268 N.C. 434, 150 S.E. 2d 775 (1966). However, the modification of a custody decree must be supported by findings of fact based on competent evidence that there has been a substantial change in circumstances affecting the welfare of the child, and the party moving for such modification has the burden of showing such change of circumstances. Blackley v. Blackley, supra; Shepherd v. Shepherd, 273 N.C. 71, 159 S.E. 2d 357 (1968); Crosby v. Crosby, 272 N.C. 235, 158 S.E. 2d 77 (1967).
288 N.C. at 87, 216 S.E. 2d at 5. Such changed circumstances must be substantial; that is, “[i]t must be shown that circumstances have so changed that the welfare of the child will be adversely affected unless the custody provision is modified.” Rothman v. Rothman, 6 N.C. App. 401, 406, 170 S.E. 2d 140, 144 (1969). See Hensley v. Hensley, 21 N.C. App. 306, 204 S.E. 2d 228 (1974). Further, “[w]here there is no evidence that the fitness or unfitness of either party has changed, the trial court may not modify a prior order awarding custody unless some other sufficient change of condition is shown.” In re Custody of Poole, 8 N.C. App. 25, 28, 173 S.E. 2d 545, 548 (1970).
We are of the opinion that the evidence was sufficient to support the court’s finding that the circumstances surrounding the children had changed since the prior custody order and that the welfare of the children would be best served by a modification of custody. Evidence was presented through Tommy Hall and Bessie *196Pritchard showing that since 1 October 1975, particularly after Joey and Michael went to live with plaintiff in Germany in May of 1977, Joey had severe emotional problems stemming from his relationship with Michael; that personality differences developed between the two boys; and that since their separation in April of 1978, Joey’s emotional state showed a marked improvement. The evidence also showed that since 1 October 1975, plaintiff had remarried and had the ability to provide a stable home environment for a child. In addition, there was evidence that Betsy Prit-chard loved Michael and was able and willing to care for him. The court’s findings on this point are conclusive in that they are supported by competent evidence. In re Custody of Williamson, 32 N.C. App. 616, 233 S.E. 2d 677 (1977).
Moreover, we conclude that the findings are sufficient to establish a change in circumstances of a material nature so as to permit a modification in the custody order of 1 October 1975. Having found that there had been a beneficial change in the mental and emotional state of at least one of the children since Michael resided with plaintiff, the court properly concluded that the welfare and best interests of Michael would be served by vesting his custody in plaintiff. In this respect we are mindful that the trial judge, having the opportunity to see and hear the parties and the witnesses, is vested with broad discretion in cases involving the custody of children. Tucker v. Tucker, supra; Blackley v. Blackley, 285 N.C. 358, 204 S.E. 2d 678 (1974); In re Custody of Williamson, supra. “The welfare of the child is the paramount consideration that must guide the court in exercising this discretion.” (Citations omitted.) Tucker v. Tucker, supra, 288 N.C. at 86-87, 216 S.E. 2d at 5.
In various other assignments of error, defendant argues that the judge erred in making certain findings of fact. After a careful review of the evidence presented in the record, we conclude that the evidence is supportive of the findings made by the trial court. The court’s findings of fact are conclusive on appeal if there is any competent evidence to support them, even though the evidence might sustain findings to the contrary, and even though some incompetent evidence may also have been admitted. Williams v. Pilot Life Ins. Co., 288 N.C. 338, 218 S.E. 2d 368 (1975).
*197We address in particular defendant’s argument that the trial court committed prejudicial error by failing to find plaintiff in contempt for willfully violating the prior contempt order in taking Michael to Michigan with him without defendant’s permission. Without ruling on the merits of defendant’s contentions, we hold that any error by the trial court in failing to find plaintiff in contempt could not have affected the result in this case and, therefore, does not constitute reversible error.
The court’s order below is
Judges PARKER and Hill concur.