Why do sisters always know how to upset you?

My mom and sister always fight.I hate it sooo much. When my sister is mad at my mom she always comes to and tells me how much...

because my sister left her husband and now it is started getting worse i do not know what to do

I know the name and even birth mother and father. I know she was born before me.

See my sister has lied before and I want to know how to know if she is lieing to me and my parents. My sister has lied about...

Having a sister that all ways calls you stupid

how can I fix it to where my sister gets custudy of me?

My sister always acts like a b*tch...all my friends and a lot of her friends hate her cause she is so self-centred and arroga...

So my mom always freaks out when I get a new boyfriennd that she barely knows and now I just got a new one and she hasnt talk...

because her boyfriend dumped her and don't know what to tell her family she's 22yrs old. and she is scared to become a mother...

My sister never listens! What about you!