His family

Well me and my man have been together for 3 years and our wedding is a year away. We are 13 weeks pregnant and we are thrilled about that. I don't know if I should get upset over his family or not I've met his mom, sister, and dad but that's it. The girl he dated before me got to meet all of his family...... granted his mom and sister have never asked how me or the baby are doing all they care about is him I'm pretty much invisible, but still why don't I get to meet the whole family? Idk if I should talk to him about it or not...... advice appreciated thanks for reading.