littlemissjess,
You had mentioned you are in your teens, when we are in our teens there is so much going on in our bodies and brain, during adolescence, raging hormones alone, can trigger mood swings, but still doesn't mean you are Bipolar.
It irks me when people start labeling anyone "Bipolar" if they behave differently or just can't get along with others.
There's a whole lot more to it, like the biggest thing is to be DXed by a mental health professional, then take it up with him or her, and start some treatment regimen.
I feel what's going on with the 3 of you, is just adolescence and your environment.
When I was in my early teens, I couldn't get along with my parents, as time went by we grew so close, the storm of adolescence was finally over and in the past, it does get better.
Best advice I can give, if you really concerned if you have a mental illness, is to seek professional help and then follow through.
Lots of luck