Its great to hear that your Dad is feeling well enough to walk around! If that's really how he feels, let him. Blood clots are a real danger if he stays still for to long. If he needs to lie down, he will, I'm sure.
Your joke with him was great! But I can't say I blame him for asking Tristan to help him with the dressings. No man wants their daughter to see their junk, let me tell you!
Congrats to your Dad, and it sounds like he's well on the road to healing well!
Ryuichi