“ ‘A modification of an existing custody arrangement should be allowed only upon a showing of a sufficient change in circumstances demonstrating a real need for a change of custody in order to insure the child’s best interests’ ” (Sano v Sano, 98 AD3d 659, 659 [2012], quoting Matter of Nava v Kinsler, 85 AD3d 1186, 1186 [2011]). The best interests of the child are determined by a review of the totality of the circumstances (see Eschbach v Eschbach, 56 NY2d 167, 171 [1982]).
While the authority of the Appellate Division in custody matters is as broad as that of the hearing court, deference should be accorded to the credibility determinations of the hearing court, which saw and heard the witnesses, and the hearing court’s custody determination should not be set aside unless it lacks a sound and substantial basis in the record (see Matter of Nava v Kinsler, 85 AD3d at 1186-1187; Matter of Adams v Perryman, 68 AD3d 860, 861 [2009]).
Here, the Family Court’s determination that the mother failed to satisfy her burden of demonstrating a change of circumstances warranting a change of custody in the child’s best interests is supported by a sound and substantial basis in the record (see Matter of Nava v Kinsler, 85 AD3d at 1187; Trinagel v Boyar, 70 AD3d 816 [2010]).
The mother’s remaining contentions are without merit.
Accordingly, the Family Court properly denied the mother’s petition to modify the order dated June 22, 2005. Dillon, J.E, Balkin, Austin and Cohen, JJ., concur.