sentences:  In extreme cases, one parent may accuse the other of trying to "turn" the child(ren) against him or her, allege some form of emotional, physical, or even sexual abuse by the other parent, the "residential" parent may disrupt the other parent's contact or communication with the child(ren), or a parent may remove the child from the jurisdiction in violation of court orders, so as to frustrate the other parent's contact with the children.Following ratification of the United Nations Convention on the Rights of the Child in most countries other than the United States (which has not ratified the convention), terms such as "custody" and "access" (known as "visitation" in the United States) have been superseded in many countries by the concepts of "residence" and "contact".Instead of a parent having "custody" of or "access" to a child, a child is now said to "reside" or have "contact" with a parent.