Other times this arrangement does not work out well for the parents. The child may assume he/she is entitled to the home and all the pros that come with it. Such as no rent, free meals, free cleaning, etc.
What ever the situation there are some ground rulles that need to be established before you agree to let your adult child live in your home. You want your child to become independent and live on his own. It's the best thing you can do for your child is help him become independent. First, make some house rules while he/she lives at home. Second, make sure he is getting out everyday to either a job or class opportnity