If you’ve seen the show, “The Waltons”, I think you’ll find that was a reasonable representaion of many families of that era during the Depression, with the core family and the grown children, if they were employed nearby were often allowed to live in the house to defray the costs of living.
The Waltons is a perfect example. Call me Pollyanna-ish but families should try to help each other. Now, if the issue is drugs, laziness, etc... then they need to go learn on their own. However, if a loved one needs some help... that is what family is supposed to be about. IMHO, if a parent says, “Sorry you lost your job but you’re grown now so good bye” then that sets a family pattern. When Mom or Dad get older and may need some help with driving or being checked on... why shouldn’t the adult child say, “Sorry you are old but I’m grown now so good bye”.