I need a lawyer's opinion but I'm going to ask yahoo anyway....?

Okay well my grandmother about 25 years ago bought a land for $25,000 in Beirut, Lebanon. She gave the money to her son to buy it for her but she was with him . She left it in the Crook's name till this day, but wanted it back in time of course she just didn't do anything about it until she felt it was needed because she told my mother and her now other deceased son that they would split the land in half when she passes away one day, Which she did this past January God bless her soul. However the same week before she passed she was going to go to his house and ask for the documents and papers to get her land back. He said to some of my relatives even if she came he wouldn't have given it to her cause he knows she's giving it to my mother. Now guys this guy is almost a billionaire without the land he owns so much land and owns so much money from his restaurant. He's a crook because this land now is worth about $250,000 from letting it sit over the years and wont fess it up. One of my mother's cousins is in charge of the military in Beirut ,Lebanon she is in her 60's and she is rich herself and was with my grandma's son and my grandma when they bought it and she know's my grandma wanted to give it to my mother. My mother and my sister's well we do okay sort of struggling but hanging in there and are thankful for what god's given us. My mom has 9 brothers and sister's if you minus him and her deceased brother then thats 7 people that are aware of this situation. If we fight this case how likely are we to win what my mother deserves? She works her *** off for lousy pay and i don't like to see her like this..One day i know i will try my best to become successful and help her out but i dont like to see this crook get away with whats not his. Nobody in the family speaks to him hes a psychopathic monster. Any advice would be appreciated thank you.