A Question Of Child Abuse

A mother brings her 11-year-old son to the doctor because he is having leg pains. The mother reports to the medical assistant that her son often falls down the stairs and likes to play "rough" with his siblings. An x-ray shows one new fracture and evidence of several old fractures. When the mother steps out of the room to use the restroom, the son says that the injuries are not from "accidents".

Question: Legally, what responsibilities does the medical assistant have regarding the son's statement?

Question: Can the nursing assistant be held liable if it turns out the injuries really were from current/past accidents?