Going against our culture's idolatry of "family" so that you can protect the family you are actually responsible for is so hard that most people just don't do it. It sounds like you're getting good feedback already that supports your responsibility to protect your children, so I won't repeat that. I am writing to say I hope you get lots of support (professional and mutual support programs) around this kind of thing.

She/Her ~ Buddhist Minister at Deep South Dharma. Brainspotting Professional. Writer. All about Practice.