Yes it is, Princess....to do what you can from afar. My dad was caregiver for my Mom for 8 years (Alzheimers) and we all worried so about him. She may qualify for all kinds of help which would only relieve your dad and let him get much needed rest, hopefully. It's good you recognize your own limitations...so many families don't and then wonder why they're tense, exhausted and depressed!
_________________________
If we couldn't laugh we would all go insane ~ Jimmy Buffett