Kudos to your mom. If it makes her happy, it's probably good for her.

Random thoughts:

One or two daily meals with everyone together helps forge a positive group dynamic.

Help with cleanup. (Though watch out for generational pitfalls; I have been shooed out of the kitchen by my aunties, who are busy making order and visiting, and don't need a ham-handed male getting in the way. I kid you not.)

Give the guys a project or two. Men don't care to sit around and discuss their health conditions (and would likely rather slit their own throats). They'll jump at the chance to build a shelf, reshingle the garden shed, improvise an outdoor shower, you name it.

Kids (increasingly) are too used to being entertained artificially. They've forgotten how to do it on their own. An adult who's willing to spend time with them, teaching how to have fun without electronics, will be a hero to kids and parents alike. Not to mention changing the world just a little. And preventing the whining, which is a contagion like no other.

A spray bottle by the toilet or outhouse, with a bit of dish soap and a few drops of bleach, helps everyone keep things tidy.

This for introverts like me:
Maintain and respect one private space for the host. The host is not being a grouch for going off on a long walk or out to the cabin to read and have a pint in peace. He is recharging his social batteries and will be with you shortly.