Theories: First, I'm very much NONpolitical, but maybe they are undocumented???
Second: He could be estranged from them.
Third: Perhaps they just don't want to be on camera. Look how shy he seems to be.
All that being said, as a music teacher, I feel that he is an extremely gifted savant, but not necessarily Idol material.
I think that Laine has been the chosen one from the beginning when he was "just there to support a friend" and was "talked into" auditioning again. True, he's not the best singer, but he has the Teenybopper Idol look.