How can we transfer deed to this VETS name.

This Vet His Name is JOHNs ok. Lets put it this way he has a Gurlfriend that told him that she new someone that had some Acres that the TAX'S were owed and if he paid for it . it will be his Property. Now my husband and I have a small company Call Odales handymen services. His so call son that is not. Call the compnay that they needed cleaning of some Land. We went to check it out we signed papers to clean land. Mr.JOHNs is a 86 year oldman His a disable VET got shot twice whin in war. HIs been miss led by this woman. Until we asked him about the dead of the property and a map. The reason was ther was no line no poles where it would indicated us wher the land stop. Then we found out he had no deed for the property. Had only receipt where he pd 2,000 thousand dollars for back TAX'S. And he is thinking all this time is his LAND and he can do what he wants w/the Land. He told my husband he wanted. to build a home and Build 2 Ponds w/fish on it. have some pigs,horses,cows , Greenhouses on and on. He had big DREAMS for this land he thought and concedere his LAND. Now his spend 7,000.00 dollars . What can we do He has been robb blind. his very Old Fashion. HIS Known this woman for only 1yr has a son that is 35 yrs old. She says she is 62 yrs but i don't think so she seems to be in her early 50's. or so. Now how can we help this VET to get this land under his name..is still under the GF dads name. We went to the Court House Thats whin we found out that the GF'S deseas DAD owns lots of land but did not left a will to nobody . Again how can we help this VET? VERY
CONCERNED COUPLE FROM TEXAS. PLEASE HELP US HELP HIM. ANY ADVICE WILL HELP. THANK U.