My guess is that "essentially estranged" sister is going to pretend that nothing happened in the past. FWIW, I'm convinced that she has narcissistic personality disorder. What started the problems that ended up in them pulling away from the family was I got tired of her crap and called her on it.

Yes, go slow is a great suggestion. And the kids and I have an AirB&B so we are not staying with them.

Thanks, everyone!