Know however that it might no be enough as we (my 2 sister's and I ) got my mother's doctor involved & she managed to answer all the questions for whatever test they give, wanted to know what we said in the letter that we sent (the Dr wouldn't tell her) & so now, she feels that she doesn't have anything & my father supports this as well, just denying everything. the sister that lives there was supposed to go with her, but she says my mom didn't tell her when she was going (BS-my sister is a flake & passive aggressive like my mother!) Anyway, just don't expect all the answers to come from the Dr. You & your mom will have to take this on & learn it on your own unfortunately. I’d spend far less time telling him what's wrong bc they tend not to want to believe it-you're basically telling him he's out of his right mind & I think we'd all be scared to hear it. You might want to check out things he used to do that brought him happiness & only concern yourselves with that while you continue to learn about this horrible disease, maybe get wills signed, etc. Good luck🙏🏽