Or you could just scrape the laws about custody, alimony, etc. and just let people figure it out for themselves. If the child is old enough (say >8 yo) ask them

Or you could just scrape the laws about custody, alimony, etc. and just let people figure it out for themselves. If the child is old enough (say >8 yo) ask them which parent they want to stay with. Younger, and let people just figure it out.