Father is trying to get custody from my daughter and says if he gets custody the grandparents won't be able to see the grand children.
Let's clarify your question. Father is trying to get SOLE custody? Or primary residential custody? The reason I ask is that if he is trying to get primary residential custody then the mother can let the children see the maternal grandparents during her time. He can't stop that unless he gets a court order.
If he is trying to get sole custody and he succeeds, the maternal grandparents can file a petition for visitation but they must show a parent-like relationship with the child and that the child will suffer significant harm if they are denied visitation. This is a very tough burden to meet- babysitting doesn't satisfy it. It must be much more- it must rise to them having raised the child.
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