My father died in 2016 without a will (or at least that is what my younger brother stated) and now he wants me to sign away my legal inheritance.

I am looking for a good contingency lawyer or one that specializes in inheritance issues regarding no will law. My father won 1.6 Million dollars from a lawsuit against a pharmacutical company many years ago, and all I saw from that was 1,500$ and I was told that I was "lucky" to get any at all since my father was not obligated to give me any of it. My father passed on July 24th of 2016 and left no will or instruction to me or any other family member, so it is on my brother's word alone that he had no law and no intention of allowing me any inheritance from the house in both their names or any finances left after his death. My brother recently texted me asking me to sign away my share of my father's share in the house and finances so that he could get a mortgage and remodel the house. I would be willing to work out a plan of payment when the case is one, but I can not afford to pay upfront.