Who gets the kids in a breakup?

Who gets the kids in a breakup? So in California (and every other state) when couples break up, the biological mom has a valid custody claim by default. Of course, mothers can lose custody, but it takes behavior that clearly puts the child at risk to make that happen.

So in California (and every other state) when couples break up, the biological mom has a valid custody claim by default. Of course, mothers can lose custody, but it takes behavior that clearly puts the child at risk to make that happen.