legal age

What is the name of your state? texas

a boy who is 17 and living in florida with supposed father (no proof), wants to leave and come back to texas to graduate. father does not have custody of him. noone does.he was living here with mother until she died.... then lived with grandparents. when they died, family friends took him in... when he became too much, they shipped him to florida to live with said father.. father has threatened to file a runaway report if he leaves.
what can we do?

[stealth2]

Who are you in relation to the boy?

i am of no relation other than friend... my kids went to school with him when he lived here and they were friends. when he came to visit for a few days during the summer, he stayed here with us. he cried when he left and thanked me for feeding him , being so nice to him, and letting him stay. HE had to save up his money to buy the ticket to come here. (he works at a fast food place)

i don't want "custody" of him, i'd just like to give him a so called family life until he graduates which will be in may. i just want to give him a place to stay, sit in the stands and watch him play ball (noone does that for him), and just help him get on his feet after graduation.
he's never been a part of a "family"...

(and when i say he became too much for the family that sent him to florida... i mean, they got tired of giving him lunch money, game money, rides to games, to work..etc).. he's never been in trouble with the law, nor has he been in trouble at school.