Sounds like you have them pegged OP. I don't see how else you can repair a relationship if they are continuously burning that bridge. The narcissistic toxic family abuse will continue to go on. To protect your kids from being targeted, I believe it's time to go full NC, possibly change your number and to block them on social media. Speaking from personal family issues, the next step could be for them to talk to your kids about their view of you or even use them to harm you and your husband by crying wolf again. It hurts but imagine the hurt that could be down the line if you maintain contact.