Two years ago we brought my 65 year old mother in law and her 69 (ish) sister.
She would have never done Disney had it not been to spend time with us and her grandchildren. But I am very blunt. Making her happy, going at the speed they needed, doing the things that most interested them, was going to my my kids miserable. And keeping them happy, moving at their speed and doing the the things that interested them would have put them in the hospital! So we needed to compromise so that everyone could be happy. Although I think she'd have liked to have us with her, she saw the logic in this argument - and when convinced to follow her own interests, her and her sister (who lives in another state - so it was time they treasured being together) had a wonderful time poking through World Showcase while my kids rode Goofy's Barnstormer.
Something you might want to consider is scrapping WDW and doing a Disney cruise. The pace is a lot slower, and there is plenty of time for you to spend as a family - but the ship is small enough so breaking away doesn't seem anti-social.
She would have never done Disney had it not been to spend time with us and her grandchildren. But I am very blunt. Making her happy, going at the speed they needed, doing the things that most interested them, was going to my my kids miserable. And keeping them happy, moving at their speed and doing the the things that interested them would have put them in the hospital! So we needed to compromise so that everyone could be happy. Although I think she'd have liked to have us with her, she saw the logic in this argument - and when convinced to follow her own interests, her and her sister (who lives in another state - so it was time they treasured being together) had a wonderful time poking through World Showcase while my kids rode Goofy's Barnstormer.
Something you might want to consider is scrapping WDW and doing a Disney cruise. The pace is a lot slower, and there is plenty of time for you to spend as a family - but the ship is small enough so breaking away doesn't seem anti-social.