I need to establish sole parental custodial rights (in California), what form do I file?

Question

I need to establish sole parental custodial rights (in California), what form do I file?

Answer

The question lack sufficient information to answer. If you have an existing case, then a motion to modify custody would be the proper approach. If you are not married and filing for the first time, then a paternity petition with a motion for custody would be the approach.