I Need Advice!!!

My sis & my mother dont agree.They never have,but in july(2011) my sis got into it with my mom & her husband.It's now Febuary(2012) & I cant speak,see,or talk to any one of my family members who live with my mom.I miss her,but I never show it.I'm the middle child on my mom's & dad's sides of the family.Im the most mature though.I don't know why.Im a thirteen year old girl & everyone says I have the maturity of a twenty-seven year old.But I still miss my mom!So,So very much.