Oh these are hard...
1-Yes, I would end their life. It would be difficult but if they were going to die either way, I wouldn't want them to go in pain.
2- Also tricky, but in the end I think it isn't a good idea.
3-No I wouldn't. It isn't my place to put everyone's life at risk.
4- I really don't know. I'd wouldn't be able to live with myself either way, so possibly the former. But they're both way too awful.
5- If they were all certainly going to die without it, then probably yes. If not, then I couldn't do that. I guess I'd see if any of them consented to it. But if they weren't in a position to do that, maybe the oldest one. I really don't know.
6- Haven't watched it.
Well that was disturbing.