Every family is different. In my family, all of our doors are open to each other no questions asked, no matter what. We also don't have anyone that would take advantage of one another either. Kids are your kids forever. I would (if this were ME , not saying you should or should not do this) is immediately sit down, plan an "exit strategy", open a special account, and have them put X amount of $ in every two weeks instead of paying bills. If a job or education is an issue, help set that up as well. Unless this is for sure a long term thing and you all WANT to live together. Some families do that nowadays. In that case, then split the bills and rent, etc. Every family, every situation is unique
Good luck to you! 4951