An elderly uncle died and his lawyers wanted all of our addresses

It seems to me there are at least two possibilities. 1) he wants to name you in his will or trust (to give you money) or make you an executor or trustee and his attorney suggested he get your addresses. It's not required but I have seen it done like that. or 2) he is mad at you and is going to sue you. Thus he needs your address to serve the papers. Of the two options I would say the first is more likely but crazier things have happened! Good luck. -John