Alrighty then, I am the outlier here and totally support jseattle.
It was Benjamin Franklin who said 'fish and guests stink after three days.'
Just my opinion but anyone staying in one's home for two whole weeks is certainly an onus. (Best friends & family included)
So jseattle most people never let peeps into their home for two nights much lest two weeks. It's dishes laundry meals cleaning smiles conversation blah blah whatever.
Yes your MIL has Alzeimers and there are challenges but this is a two person proposition. You and your husbands are both hosts.
Go to your IOP it will be a chance for to be out if the house.
I totally disagree with a previous poster who suggested you suck up (my words) & make it all about your husbands situation. This situation is all about your sobriety.
All about your sobriety.
Been there there, done that, Stacey it won't be easy but you can do it.
(PS: leave the house as much as possible & do it with grace)