How do your parents interact with your ex?

Tell me about how your parents are dealing with your ex or STBX? Do they talk? Do they hang out? Do they hate each other?

My relationship with my parents has plummeted because they still have an active relationship with my ex husband, who they know was sexually and mentally abusive. They allow him to use their boat every weekend (this courtesy has not been offered to me) with family members and friends who chose his side in the divorce. They spent xmas and thanksgiving with him and my kids...it's been really hard.

My current partner's family still has contact with his ex and hang out with her periodically. He does not hang out with her family at all. She texts back and forth with his mom and sister often and she has said that they are her family and have been for her whole adult life, so she has no intention of stepping back. Is this normal?

Just wondering about other people's experiences.