My Bf and children’s mom

So me and my bf have been dating for almost two years now we are expecting our baby girl early nov and I’m just starting to get frustrated with things that’s going on to the point where most days I feel like it’s a deal breaker. I do love him and I love how he is with his children it’s just their moms that drive me crazy.

So first my bf has one son and he decided to take care of his brothers son who passed away. His baby mother doesn’t call unless she needs something or it’s an emergency or whatever but his brothers baby mother is extra needy. She calls everyday almost all day asking for everything. She also has two other children so she is always calling basically looking for my bf to be the father to all of her children just bc he decided to take his nephew as his own. My question is, is it wrong for me to feel frustrated by her constant clingy-ness to my man. I feel like I am always second place to her and she isn’t his baby’s mother. She wants my daughter to have play dates with hers but she does not like me and she goes out of her way to ignore me and tell his baby mother everything I do. I have told my bf that my daughter is never allowed over there due to the fact that she doesn’t like me, I’ve only met her twice and she isn’t a stable person. Am I wrong? I just feel like she takes advantage of his big heart by asking for way to much. He doesn’t need to be in all of your kids life just his nephew.