Nervous to meet my boyfriend's family

I'm not usually nervous to meet people, but I'm kind of scared about this! Lol. We haven't been together long. We've only met two and a half months ago. His cousin is getting married soon and he chose me as his plus one so she wants to meet me. They are having a get together on Saturday and I am so nervous. I think I'm nervous because now that I'm older, I'm in more serious relationships. There is a possibility these people could be my in laws in the future! That is so crazy to me. Any advice on how to calm the hell down? 😂 Any stories about meeting your significant other's family?