Estate Planning USA.com

My mother was killed in a car accident 3 years ago. She was divorced from my stepfather, but they still owned a house and land together. Now that my mother is dead and her estate case has been closed, it recently surfaced that this house with both of their names on it was still in existance. Now that my mother is dead the house defaulted to my sister and I owning her half and my white trash drunk stepfather owning the other half. He is trying to force us to sign over our portion of the house so that he can sale it and pocket all of the profits, but my sister and I are planning on fighting him for whats ours. Our mother hated him and would want it that way. So we are in the process of finding an attorney but not sure what kind of attorney we need. Do we need an estate attorney even though her estate case has been closed? Or do we need a different type of attorney??? Any suggestions?