<human>: Condense the text into a few key points

A good friend of mine and his fiance need your help reddit:

My friend is in a relationship with a girl who has a beautiful three year old son; the child's father who is largely if not entirely out of the picture (**no child support, little to no attempt in contacting the mother or child**) recently contacted the mother asking to have the kid for about 13 days so his family can meet the child. How can the mother make sure she gets the kid back? If she allows the child to go is possession 9/10ths of the law? Or is there any way for the mother to guard against the father refusing to return the child at the previously agreed to date.

Relevant: The final child custody hearing isn't scheduled for a few months.
<bot>: How can a mother make sure the father of her child brings her child back and doesn't attempt to just take the kid and use that against her for a child custody hearing.