Maybe your dad was trying to lighten the mood? IDK...seems inappropriate and very hurtful no matter what his intentions were. I guess if it was me, I would gradually try to let my parents know what was going on, without minimizing it. I find people making jokes about sui in general to be very hurtful. Perhaps if your parents knew how much you were struggling, they would be able to be more sensitive. Hang in there, okay? You did a good job in the first step of letting your parents in a little bit, now if you can find that same courage to open up a little bit more, they might be a good support resource for you. Good Luck!