Family can be so awful some times, my Dad made fun of my depression this Saturday and it got me feeling really insecure. He attacked me because I stood up for my sister. So I can understand how you're feeling.
Dont worry too much sometimes siblings can be mean to you but that doesnt mean they dont care about you You should try to know them better by talking to them more. Plus you don't have to care or think about what others say about you cause you know its not true, just brush it off and get on with your life by doing the things you enjoy Im sure it might seem that life sucks right now but im sure ill get better soon So cheer up and try talking about it to a close friend or someone you know which might make you feel better.