GOOD for you!
You have the optimism, the overconfidence, and the self-righteousness of a true newbie... You'll need all of that and much, much more. And I sincerely wish you nothing but the best in your efforts to "stick it out" and be "good on (sic) your word."
By the way, you make no mention as to the age of the one remaining child you and you husband still have at home...or to your financial situation, for that matter. Is your husband working still, or is he retired?
I also assume you'll want to provide the same quality care for your husband's parents and grandparents when the time comes... And of course, you're anticipating no medical needs of your own until the entire rest of your family has crossed over "The Rainbow Bridge..."
It's always a real eye-opener on this site (as well as refreshing and uplifting) to meet truly superior people like yourself: lacking any humility as well as any compassion for the struggles of other mere mortals who come to this site for support in their times of weakness.
By the way, please do check back and let us know if you still feel the same way - eight, nine, or ten YEARS from now...( assuming, of course, you even manage to make it that long...)
Yours, With the Sincere Bemusement Long-Term Experience Alone Can Provide,