Do you think it's wrong to disown a family member?

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Long story short: When my mother was 2, her real mother abandoned her, ran off, and married a traditional Catholic man... her mother never told him that she had been married before and had given birth to 5 children... she later fathered 2 more daughters with her new husband. I grew up, moved away from home, and on 2 occassions, have had to stay with my mother again. She showed a great deal favor to my sister.. providing her with new or lightly used vehicles, cash, designer clothes, and letting her run wild. My sister is too now grown, but the preferrential treatment still continues, despite that my sister and her boyfriend combined make well over $20/hour. Despite actually driving by my house several times a week, my mother never comes to see me. She lives miles outside of town, I'm mildly disabled and have no vehicle. There's no public transportation available here. On the paternal side, my daughter's family all live in Florida, Michigan, and Mexico. On my side, within 20 miles of me & the half aunts in California. All summer, my daughter begged to see her grandmother (my mother). It never happened... I found out that instead, my mother had been babysitting my niece 5 or 6 days a week so that my sister could work and have her weekends free. Asides from sending my daughter to school, I've not had a day away from her in over a year. Recently, my mother, aunts & uncles contacted their half sisters and told them the story of what happened with their mother, and now my aunt is coming from over 1,600 miles away to visit. However, I realized that my mother had introduced my cousins and sister via Myspace and the phone and email to my aunt.. and totally overlooked me. I only learned of this visit from comments my aunt left on my mom's myspace & my sisters. Well I think that I've had it. No one, literally, in the family makes due effort to stay in touch with me, and it's really hurt my 8 year old that her cousin is always with my mother, and yet my daughter hasn't seen her in a year... My mother didn't even come to visit for her birthday that she promised. I could go on with the differentials for hours. I'm seriously considering just disowning the whole lot of them. Does anyone feel that I might be or am wrong in considering this action?