While my ungrateful family was inside my hot sauna, I locked the door so no one could get out without my approval
That's dangerous. Were everyone ok afterwards?
Everyone is going to be fine. I sent them plenty of food and drinks from the outside.
Well I hope that they have already gotten out. You are lucky no one died of heat exposure. If anyone did, you'd rightly be arrested for murder.
They are my family so I did it for their own good since I'm the only one who cares about them.
From what you say, it sounds like you don't care about them at all, otherwise you wouldn't have subjected them to this kind of torture. Even if you think they are being ungrateful, this is reckless and unjustified behavior, and I think you need to apologize to all of them.