I was the caregiving child for both of my folks. Some of the nicest things one of my siblings, who lives 500 miles away did. -
sent me flowers thanking me for being there
bought me a gift certificate for a massage
sent me cards telling me how much I was appreciated.
Sounds like you are there for him, which is great but for some reason getting something physical that was just for me meant alot, especially after my last parent passed away.
Thinking of you!