Parents charging rent ?

Once a child is an adult its parents have no further legal responsibility to it. Likewise once a young adult is grown and out of the parental home they have no legal obligation to their parents. This is in most western cultures, clearly in some other places there are expectations that adult children take care of their parents. 

Are you an adult?  If so, you should be willing to contribute to the household expenses..so stop acting like a spoiled child.

you living in a different world come down to earth

If you share their property, you pay your share.

Discuss it openly with them.

Answering as a parent of two. My children are welcome to live in my home rent free as long as they are successfully enrolled in ongoing education and pursuing their first degree or certificate. If they are not going to school, have flunked out, have decided to be a professional student, or have decided to take time off, they are expected to pay rent. It is not what market rent would be for them to live on their own, but it helps them to be responsible and make responsible choices (as in, they have to be working and making some income rather than sitting on the couch playing video games all day). 

Ironically, the legal protections of them paying rent do more for them than if they weren’t paying rent. Technically, once they are 18, I can kick them out of the house and refuse to provide for them and that’s legally fine. But if they pay rent, then I have to go through the legal process in my state to evict them.

It is never the obligation of an adult child to help their parent maintain their home, although many do, especially as those parents age and it is less safe for them to do some tasks. If parents can’t afford their living situation, then the family as a whole, including all children should have a discussion about options. If children want to offer their parents financial support, they certainly can, and many do. If a parent can’t afford their current home, they may need to downsize or move in with an adult child. I do not expect my children to support me, which is why I work and save.

If the child is not a legal adult, then no, they should not have to pay rent. However, when they become an adult (18 usually), if they live in a parent's home, paying rent is a way of being responsible for themselves and contributing to the household like the adult they are. 

If they don't live in the home but the parents need help, I believe that family should help each other, but there are definitely times when it's not right, fair or possible to do so. It just depends on the situation. 

No idea what you are really asking.  Is this an ADULT child?  If so, it makes perfect sense to charge them rent.  Instead of posting in round about scenarios, ask us exactly what you want to know.  What is going on that you are questioning?  How old are the people involved?  Why do you feel the parents can't afford their home?

I don't exactly know what you're asking but for me it's very wrong for a parent to charge their kid rent. You're the one who had them, it's your responsibility to take care of them.

It became the child's obligation to help pay for the bills when they're already working. The child should be actively working/looking for work, not just leech off of the parents. Basically be filial to your parents.

If the parents somehow is struggling financially, they should sit down their kids and explain to them what's happening and what's going to change around the house.

The parent  may be helping the child grow up and assume responsibility.  The child (I presume this is a adult offspring) has no legal obligation to live there and the parent has no legal obligation to maintain them.  Usually they can come to terms, but if necessary then they can try a landlord and tenant arrangement.  

      I charged my daughter rent until she decided to go to college.  Then I refunded it all.