How do I deal with my long-term boyfriends family/ex and their relationship?

Relationship Questions and AdviceCategory: CommitmentHow do I deal with my long-term boyfriends family/ex and their relationship?
Courtney asked 7 months ago

My boyfriend and I have been together almost 5 years and have 2 beautiful daughters. He has 4 other children from a previous relationship. Which isn’t the problem but, their mother is. She is always over at his families house for get togethers, holidays, and just to hang out. His sisters always imply when she isn’t around how “cool” she is. And the whole family is friends with her on social media. The ex has a twin sister whom is just as comfortable coming around and “hanging out” as much as the ex is. Her sister even told my children that she is their aunt! I don’t want to just stop going around but, this is just so bizarre to me. The whole reason they broke up was because she cheated with his cousin, whom is usually around at these get togethers and it’s like it doesn’t phase her. Please give your honest opinion and best advice. Open to all answers.