then in my eyes your ARE NOT a parent. if your ex or anyone else is doing the raising of the children, THEY are the parent, not you.
judges almost always rule in favor of the mother, unless there is proof that the child won't be cared for properly by the mother.
having kids in your house every other weekend does NOT make you a parent, and a good mom doesn't lose custody of her kids for no damn reason.
hell my kids grand parents have them over at their house every other weekend, that doesn't make them parents to my children.
if you dont have custody, it is probably because you are a shitty mom.