Name changed for this as it could be outing...
My sibling still lives at home, they are well into their 40s and have no plans to leave. Their two children who are both in their early 20s also live there, again with no plans to leave. No one pays anything in the way of rent or contribution towards the bills, and my parent often pays for the food shopping. My parent has never asked for any contribution, though it has never been offered. The house is messy and fairly dirty, with fingers pointed at who does the least, but in reality I don't think anyone does much housework at all apart from my parent, who is getting on in age now.
It could be an ideal set up to have multi generations living together. However, it just is not. My parent resents them being there, but also fears living on their own. My sibling resents being there, though they have grown so used to having a completely disposable income, that they fail to see that if they budgeted a bit then they could actually afford to move out and pay rent. Like most of us do. They live month to month and I think they are actually somehow in credit card debt, despite earning well.
It's a weird, toxic co dependent relationship and it's draining to visit and have to listen to both of them moan about the other one. I think my sibling is setting an awful example to their two children, and that they will all really struggle when God forbid our parent is not here anymore. My sibling would have no idea about how to run a house on their own, neither would their now adult children.
For that reason, no way in hell will I let my children live with us completely rent free. I will support them as long as they are in full time education, and will be happy for them to continue to live with us after they have got a job, but I will be asking for a contribution towards the bills and will expect them to help out with housework and cooking etc. So hopefully they develop into a functioning adults rather than forever staying a moody teen like my sibling.