My family,two faced??

i had an argument with my mum ast night,pretty bad one,and now ive had time to sleep,i admit its my fault,but i said something to do with my sister,was something like she gets treated better?anyway mum went bad and told sister,now she aint talking to me either,feels like theyve all ganged up on me,yes i know its my fault but my mum has said plenty of stuff about my sister,but i aint gone back to tell her,they two faced??