Ordered that the order is affirmed insofar as appealed from, with one bill of costs.
In determining whether a custody agreement should be modified, the paramount issue before the court is whether the totality of the circumstances warrants modification in the best interests of the child ( see, Friederwitzer v. Friederwitzer, 55 N.Y.2d 89, 94; Matter of Teuschler v. Teuschler, 242 A.D.2d 289; Matter of King v. King, 225 A.D.2d 697). The determination of a custody award to either parent depends to a great extent on the hearing court's assessment of the credibility of the witnesses and of the character, temperament, and sincerity of the parties ( see, Eschbach v. Eschbach, 56 N.Y.2d 167; Matter of King v. King, supra). The court's determination should not be disturbed unless it lacks a sound basis in the record ( see, Eschbach v. Eschbach, supra; Matter of Lopez v. Lopez, 233 A.D.2d 398, 399).
The record supports the Supreme Court's conclusion that the level of conflict between the parties is such that a change in custody would serve the best interests of the child ( see, Dintruff v. McGreevy, 34 N.Y.2d 887). The mother, in a significant number of instances, has interfered with the father's visitation rights, thereby demonstrating her failure to place the best interests of the child before her own interests ( see, e.g., Matter of King v. King, supra; Maloney v. Maloney, 208 A.D.2d 603).
We discern no improvident exercise of discretion in the visitation schedule fixed for the mother by the Supreme Court ( see, Matter of Sandra C. v. Christian D., 244 A.D.2d 551).
The remaining contentions raised by the mother are either without merit or not properly before this Court.
S. Miller, J. P., Santucci, Sullivan and Florio, JJ., concur.