Dear Dr. Beth, I am in a blended marriage and we each have two children.  My children are a boy and girl, 12 and 10 years old.  His are 2 girls, 13 and 16 years old.  His children stay with us on weekends and mine live with us most of the time and spend part of the time with their father. The problem is that the holidays are coming and there always seem to be tangles and arguments about who gets what part of the holiday—which of his girls’ parents gets Christmas Eve and Christmas Day, etc.  The worst part, though, is that his kids resent me and don’t really want me to be part of their holidays. They just want to be with their Dad.  How do I handle this situation?