Family in law drama ? 1 month postpartum HELP

My partner and I have been married for just over a year. His family gave us nothing but problems prior to the wedding (mostly mother and sister) ; for background purposes relationship with my family is very close and supportive. (I’m very close with my mom). I’m finding it hard to navigate his side of the family and need advice.

Fast forward we have welcomed our new baby, which seems to have only made things way worse. We laid our boundaries and lay the foundation as to what is to be expected (no kissing the baby, washing hands, no posting on social media of their face unless covered, ask before coming for visit) it’s been nothing short of a disaster. My husband has never had to set boundaries with his family which they seemed to be fine with until the baby was born. His mother (my MIL) asked to post a photo of her we agreed and was a naked photo of our baby on Facebook with other photos of her face (has been taken down). His sister is nothing short of an opinionated a-hole who gives her opinion and tells me how to raise my daughter (told me my friend can’t be called aunt because she’s not the babies biological family, upset my friend posted baby but covered her face as asked).

My MIL seems to dismiss my family, think my walls are up and says we have ”rules and regulations” she spam texts my husband nonsense essentially claiming its all coming from me and not us as we discussed prior. He has been trying to navigate being a new husband and father as well.

We live with my parents, I am very close with my mom. Unsure how to navigate this relationship as there’s A LOT more to this. Any advice on how to approach gatherings/ being around his side of the family without making it seem as if I’m drowning while being 1 month post partum. They have also seen the baby over 5 times in a month (making it seems they don’t ever see her)!!!

His family makes sly comments about ”their family values have changed” since the baby has been born. He has a family who is a little rough around the edges not saying my family is perfect! He also I think is having a hard time navigating finding his voice despite he is doing a great job advocating for his wife and being a new father ! HELP