the situation here in the UK is as Janie stated in the US. You, as a family member have no rights over someone else's private information in regard to treatment or other interventions, under the MHA {1983}. Obviously I don't know how it would help you to know in any case, surely the situation as it is now is what requires dealing with, not past history.

If you are suggesting or feeling this person may benefit from mental health interventions now, there are a number of routes into services but I would need to know more detail to help. PM if I can be of further assisstance.