Yikes. Very worrisome. I hope things are going okay. She should have told you. I guess, at least he did. I don't know your family dynamics enough to advise you on how to talk to her, but I guess you just have to find a way to let her know you want to share.

And she should, one because she's your mom, and you want to know. And also, because sometimes heart problems are genetic/inherited and it might be a reminder for you to take care of yourself.