I had this situation before. Worked out great! First month was a freebie, we'll let damn near anybody move in. After the first month they are on contract. What does that mean? The live in's do their share. They contribute either to the expenses thru money or to the household thru work. We live on a farm, plenty of work to do!
One family stayed with us more than six months. The house was spotless, the laundry done, the porches mended and fixed, the gardens tended. Worked out great!
Freeloaders find that the fridge and pantry and stocked with only water, veggies and rice. But then we have the same policy with our teenagers
Only once have we had to ask someone to actually leave.