Would you allow your adult son or daughter to live with you?

So me and my husband grew up in completely different households. It was always obvious his mom couldn’t wait for her children to leave home. She started charging him rent at 16 years old and if he didn’t like it he could leave and find his own place. When her oldest child split up with her fiancé she had no where to go since she was living in her finances house. She tried to come back home (she was 21 at the time) and her mom said no and let her sleep on the couch for a week then made her leave. She refused to let her stay in her old bedroom because she knew if she let her in the bedroom she will stay longer. When my husband turned 18 it was immediately he needs to leave because he is a adult now.

My parents always told us we are welcome to live with them whenever we need to. I am almost 30 me and my husband have our own home but I still have a bedroom at my parents house. I actually never even referred to it as my parents house it’s my house too. My husband has made comments when I refer to my parents house as my house but to me it will all be my home it’s where I grew up. My parents never made me feel like I don’t belong there when I was a adult or never told me I need to leave. Honestly I know they would be happier if I moved back in with them now lol.

I feel the same way about my children my house is their house and I could never kick them out on the street or make them feel unwelcome when they grew up. Just curious what everyone’s views are on this?

Are your children always welcome is there certain circumstances that they aren’t welcome? Or when they are a adult they have to leave the nest?

Edit- yes his father was in the picture but he was not with his mom. His mom was remarried to his step dad and his dad paid child support.