Kortlang v. Kortlang

“ ‘In order to modify an existing custody or visitation arrangement, there must be a showing that there has been a change in circumstances such that modification is required to protect the best interests of the child’ ” (Matter of Manzella v Milano, 82 AD3d 1242 [2011], quoting Matter of Arduino v Ayuso, 70 AD3d 682, 682 [2010]) “ ‘The court’s determination [with respect to custody and visitation] depends to a great extent upon its assessment of the credibility of the witnesses and upon the character, temperament, and sincerity of the parents’ ” (Matter of Manzella v Milano, 82 AD3d at 1242,…