My husband's neice and her family (total of 2 adults, 2 children) have moved in with his mother to assist with managing the household. The neice is available 24/7, responsible for meals, shopping, and monitoring medications. Her husband tends to the yard but my husband still maintains any issues with the home. We want to be fair in paying wages but also want to consider room and board as we will be paying the wages and my MIL furnishes all room and board. They have no transportation and my MIL's car is available for personal use while my MIL furnishes the gas and pays for all upkeep of the vehicle.
You could also call your local job services and see if they have a wage range for such services.
This sounds beneficial to all if the personalities work out.
Take care,
Carol