Thicker Than Blood (1998)

Griffin Byrne is the idealistic new history, English and maths teacher in Father Frank Larkin's school in a mainly Latino ghetto neighborhood where most kids, even many of its graduates, end up in crime and poverty. He takes a particular interest in one of the boys nobody believes will ever come to anything, Lee Cortes, who he finds to be a prodigy in cartoon drawing but who never spoke a word at school, and always wears a Walkman, essentially because of his home situation: his elder brother Tyro, a drug dealer, abuses him and his mother, so he often stays home to mind the smallest siblings. Griffin tries everything to help Lee, despite everyones cynicism, even takes him in his bachelor flat, but finds the whole family situation must be solved, which is probably beyond his power, yet tries tireless, even if he gets nothing but abuse and the results seem to do more hurting then helping...