Mom refuses to let 21-year-old daughter take her stepson's bedroom after she got kicked out of her dad and stepmom's house: 'Under NO circumstances would I EVER kick out my stepson from his room because she “wanted” it.'

She's lucky that her mom is letting her stay in her house. 

You shouldn't disrupt actual children's lives to accommodate adult children who should be able to take care of themselves. It's one thing to move your family across the country so that you can be closer to other family members. Your kid might not like moving, but they will adjust to their new life faster than you'd think. It's a totally different thing for your adult daughter to want to move back in with you after being kicked out of her old place; that shouldn't be on her terms. She should not be allowed to come into the house and change the way everybody else lives just because she says so. If a parent allows their adult child to do that in their home, then they are a pushover, and they're in for a lot of grief. 

If someone isn't paying the bills, you need to have strict guidelines and rules about what they are and aren't allowed to do in your house when they're staying there for an extended period. You might not think that your friend who is down on his luck is going to take advantage of your kindness, but you couldn't be more wrong about that. If you give an inch, certain people will take a mile, and you don't want your home life to be destroyed by someone who isn't even paying to stay there, even though they could afford it.