Boyfriends family drama

I really just need to vent and maybe get some advice.

About three weeks ago I had a big blow out with my boyfriends sister, but it was about his entire family. I’ve noticed since she’s been born that his family favors his oldest, and his niece, but now I’ve seen them favoring his ex’s daughter ( not his) who is bestfriends with his sister. My daughters five months old and has only met her aunt and grandma on her dads side. None of her other family even bother to meet her or ask about her. She has a great grand pap and grandma that she hasn’t met yet. Yet everyone in his family has met his ex’s daughter. For awhile I tried to make plans to see them, but nobody wanted to make plans or put an effort into seeing her. None of them text and ask about her, call to see her nothing, but they are constantly asking for his oldest, his niece is always at his moms, and his ex’s daughter is always around. They’ve made it very clear that they want him with his ex and not me. I told him and them that my child will no longer be around them if they can’t stop the favoritism. I grew up with my dads family treating me and my siblings differently bc they didn’t like my mom and I refuse to let my child feel the way I felt. It lead to a lot of self image issues for me and made me feel like I’d never be good enough for anyone. Even at 19 I feel this way bc of that. So far he hasn’t fought me on it, he said it was my choice and he respected it. He hasn’t spoken to his family since this happened when he’s home around me, but what really gets me is on Father’s Day none of his family told him happy Father’s Day, but told his sisters boyfriend happy Father’s Day and made post for him. He worked a double on Father’s Day so he wasn’t around me and they knew he did, bc he always works a double on sundays. I told him I wouldn’t keep him from his family and that I’d happily drop him and his daughter off at his moms since he doesn’t drive, but that me and our daughter wouldn’t be going there anymore. I don’t feel as if we’re welcomed. I’m a strong believer in “ if you don’t like me you don’t like half my child”. I just feel bad bc I feel like maybe I’m being over dramatic but it’s been happening since the day she was born. They refused to come see her when she was born bc his niece couldn’t come. Even his own mother didn’t want to come bc her other grand daughter couldn’t come, she’s 5. My baby had RSV at a month old and was hospitalized and none of his family bothered to ask if she was okay, and they knew she was in the hospital bc my sister had made a post asking for preyers. I’m just over them having favorites, especially between both of his kids. I feel like our daughter should be treated the same as his oldest, but she’s not. I love his oldest and everyone in my family treats her the same as my daughter, so I’m not sure why his family can’t.

Am I being dramatic keeping her from them? A tiny part of me feels like maybe I should give them another chance. Yet I don’t wanna risk my daughter getting hurt later in life. I told them multiple times that I didn’t like the favoritism and that she wouldn’t be around people like that, yet they continue to do it. I’m just so lost. It hasn’t caused any issues with me and him, but I feel bad. I feel like he won’t see his family now bc I don’t wanna go there, but I’ve told him he can any time he wants.