Does my SO family prefer his ex?


I am currently pregnant with our 1st baby we are going to be 5 months on Friday.

I live with him and his family. But I feel unwanted when ever I am around them or when I am at my mom's house, they invite my SO's ex wife (or ex girlfriend) without telling him anything they only do it when I am not around but my stuff are still here they put there noses in my business but yet when I bring it up they don't say anything back. My SO and I agreed on not letting 1 of his sisters and her boyfriend be around the baby but I feel like its not right

Any help out there ?

Please no mean comments