Oh, dear ... sounds like life is "interesting" at your house. So sorry your dad is disabled and has to take a lot of meds. It could be the meds, it could be something else.
If I were disabled and didn't feel well a lot, I'd probably be grumpy, too. Sometimes we don't realize how we're impacting other people in our lives, particularly those closest to us, when we show how miserable we feel ... I see that at work sometimes, where someone is unhappy about something at home or maybe they are getting a cold. They act grumpy and unhappy to those around them which makes those around them snap back and round and round they go. On the other hand, sometimes
we forget that someone else doesn't feel as good as we do and accidentally make their day more difficult, so it can be a two-way street.
Let's hope your dad isn't bipolar. That's what Amanda said her dad was. The only way to treat it is with more meds, and it sounds like your dad is taking a lot already. I'm betting he just doesn't feel good a lot of the time and that makes a person sad and grumpy.
We'll send positive thoughts your way. Sorry we can't help with the pictures!