Ordered that the order is affirmed insofar as appealed from, without costs or disbursements.
Custody determinations depend “ ‘to a very great extent upon the hearing court’s assessment of the credibility of the witnesses and of the character, temperament, and sincerity of the parties’ ” (Matter of Venette v Rhodes, 301 AD2d 608 [2003], quoting Alanna M. v Duncan M., 204 AD2d 409 [1994]; see Matter of Irene O., 38 NY2d 776, 777 [1975]). Where a hearing court has conducted a complete evidentiary hearing, its finding must be accorded great weight, and its grant of custody will not be disturbed unless it lacks a sound and substantial basis in the record (see Eschbach v Eschbach, 56 NY2d 167, 173 [1982]; Matter of Venette v Rhodes, supra at 608-609; Young v Young, 212 AD2d 114, 117 [1995]).
The essential consideration in any custody controversy is the best interests of the child (see Eschbach v Esehbach, supra at 171; Matter of Venette v Rhodes, supra at 609). The hearing court may order a change in custody if the totality of the circumstances warrants a modification in the best interests of the child (see Eschbach v Eschbach, supra at 174; Matter of Canazon v Canazon, 215 AD2d 652, 652-653 [1995]).
The Family Court’s determination that the best interests of the child would be served by a change of custody to the father was supported by a sound and substantial basis in the record and should not be disturbed (see Eschbach v Eschbach, supra at 174; Matter of Timosa v Chase, 21 AD3d 1115, 1116 [2005]).
The mother’s remaining contentions are without merit. Krausman, J.P., Rivera, Spolzino and Lifson, JJ., concur.