Disney at least in DL uses travel guard. insurance when not booking a vacation "package" though some company can and will vary.
I say go for it and EDUCATE yourself. Those who claim the dont need it are sorely mistaken. This coming from a guy who needed it once and didnt know i had it.
Aging parents you say? Do you think the place you are staying will cover your expenses if they say fall down by accident? More then likely not. Travel guard or insurance in general does. Your health insurance from work or theirs might not cover you out of state.
Are the airlines on time? NOPE, so if you miss like 4-6 or more hours you get reimbursed. Ever had luggage LOST, the airline nor the airport will delivery your stuff to you for free, you have to usually go get it yourself. Having to waste time getting there and getting it and getting back to your vacation. I know travel guard does all that for you and its INCLUDED.
But seriously educate yourself, call these places and ASK specific questions, about air fare, lost luggage,electronics, and death in the family type situations. No one even me can tell you everything but it sure as hell is worth it in EVERY situation