Advice please

So I have a question some might know or not but it's worth a shot. The past 2 people I've dated, their siblings are very overprotective but they ask my partner what im doing even when I'm not around. They are very nosey about me but act snobby when I'm around. Like idk these people at all very well but maybe that's why? I didn't plan to get to know the family well bc we are dating just not officially I guess. Idk what to do but I'm already feeling uncomfortable.