Although this Court's authority in custody matters is as broad as that of the trial court, the latter's findings and determination are accorded great deference on appeal ( Victor L. v Darlene L., 251 AD2d 178, lv denied 92 NY2d 816), since that court had the opportunity to assess the witnesses' demeanor and credibility ( see Eschbach v Eschbach, 56 NY2d 167, 173). Here, there was a sound basis for the court's determination that the circumstances had changed sufficiently to modify the original visitation order. It was clear from the record that, while the daughter still desired a relationship with the father, she did not want to have overnight visits with him due to his failure to maintain a sanitary home and to engage with her during their visits. Moreover, his comments about her developing body and his physical altercation with her over her use of a cell phone caused the child to be uncomfortable in his presence. This conduct by the father justified the court's modification of the visitation agreement to eliminate overnight visitation ( see Posporelis v Posporelis, 41 AD3d 986; Matter of Filippelli v Chant, 40 AD3d 1221).