The symptoms you have described are symptoms of a child with some type of emotional health issue. That being the case, I would recommend that if your brother has the ability to seek therapy for the child then he should do it.
It will establish that he recognizes that the child appears to be having some issues, it will beat her to the "expert" witness if one needs to be used, and most importantly, it will get the child the help he needs.
As far as the imigrant issue goes, perhaps a brief inquiry to INS would resolve the questions you have about that situation.
Good Luck
TM
Seek first to understand, then to be understood
It will establish that he recognizes that the child appears to be having some issues, it will beat her to the "expert" witness if one needs to be used, and most importantly, it will get the child the help he needs.
As far as the imigrant issue goes, perhaps a brief inquiry to INS would resolve the questions you have about that situation.
Good Luck
TM
Seek first to understand, then to be understood