My wife takes care of her dad. But he doesn’t live with us, he lives a couple blocks away in an apartment we set him up with. My wife loves him, and he is nice enough but she has some baggage with him that rises to the top from time to time, and there is no way he could live with us. And after seeing him 4-5 days in a row she has to call her sister and beg for a break.
I fully understand where you are coming from.