So prior to 2023 I had a good relationship with my DHs family. Friendly with his sisters. Then in 2023 one of his sisters started to be hostile to me and removed me from FB. I thought it was a mistake at first and contacted her but she denied it and never added me again. I then noticed if I turned up to family dos she would walk out of the rooms or leave and a few weeks ago whilst she was on speaker phone to my DH I said hello and she ignored me. I said hello again and she said ‘whatever’. She stopped coming round to the house and it affected her relationship with my daughter who she was close to so it’s obviously something she regards as significant. I discussed this with my DH and he said he didn’t know why she was doing this and he’s asked his brothers and mother and they said they don’t know. However, I feel they do know but won’t say and I now feel this situation has affected my mental health. I feel like my DH isn’t addressing it and says there is no point speaking to his sister as she will probably deny it.The situation is making me question if I can or want to stay in this relationship. I know he loves me but this conspiracy of silence is insufferable and I can’t continue to tolerate it.