How to be supportive

United States
May 7, 2020 2:12pm CST
My kids had quite a few friends in school. Only a handful stayed a part of the family after graduation. A situation had come about. I get a text message from boy A. He told me that he messed up and the girlfriend left and he's feeling secluded. I asked what was going on. He admitted that he tried to commit suicide and is paranoid. He admitted that he had been taking a prescribed med for depression. I verified with him about the past experiences causing the depression. He said yes those incidents were a part of it. He then told me that he wasn't feeling like himself and that he now wants to transition over to a girl. ??. He had never given any indication of feeling like this before and he lived with us for 2yrs! He has a 5yr old son, who can't even begin to understand what's hapoening. I don't even know where to begin with the emotional support and guidance. I'm 95% sure his side of the family is going to disown him. Watching this boy grow into adulthood for the last 7 yrs, I can't even think to turn my back on him. I want him to feel good about himself and have my house be a safe place. He did check into a mental facility to talk to a therapist. Not sure when he'll be discharged, but I want to be a part of his support system. Where do I start?
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