I can understand what you are going through but dis-owning a sis is never that simple and clear cut. If it was a friend, I support you ditching him/her 100%. But what if your folks are sick and you and your sis will need to take turn taking care of them.
I would suggest having a heart to heart with your sis and bro in law, let them know how you feel about their association with you ex and go from there. These people only show up a few weeks a year in their lives. They'll be fresh and interesting but they are not family, that's what I would tell your sis and bro in law.
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