Impossible to be illegal to open your home and have a friend or relative live with you and help out around the house or farm. There is a site called woofers been around for many years what they do is:
All workers work on Organic Farms For Room and Board
the purpose is to learn to travel to meet people all ages welcome.
Duration can be a week or a year whatever your preference
As far as it being common for homeschoolers of large catholic familes to be there for each other. Well that only works in areas where there is a higher population of catholics. Where I live there is only 1 other family the rest are 3hrs away so pretty hard to have a catholic community other than your own family.
I agree there are Widows, Seniors, Unemployed catholics who would love to just get out there and try something new. My neighbor charges $1000 per week to live out where we do, no vehicle or food included only a cabin (european clients). Now if I serve organic moose, potatoes, carrots, beets, goats milk, goats meat, eggs, pork, hams. Hmm I guess my nanny might just owe me money at the end of the week. LOL!
Isnt it great to live in a free country!!!!!