My sister annoys me a lot but I play Pokemon with her and that makes it nicer for both of us. I know it might seem like you hate your brother and sister but if they suddenly disappeared one day, you'd probably take that back.
Try to do fun things with them. o.o I'm not sure what you like doing but I play video games with my siblings, even though it can get competitive at times (especially when they beat me >:3).
Moongemowl (or just call me moon!)