Just in case you didn't know what boomerang kids are, they are just like they sound. It is when a parent raises their kids to be productive adults but for one reason or another they come back to live at home. I have a story about this but I will not use any names to protect the guilty.
The mother who thought she had already raised her kids to be able to take care of themselves has one child who can not control their overspending and giving their kids whatever they want. The overspending has caused the child to go deeply into debt and lose their house. Now instead of letting her child learn a lesson the hard way, she decides to take her in when she knows she does not have enough room. The mother says "I just want to be able to help my child out for a while so she can save up some money to move out" But instead of helping she is actually enabling her and allowing her to live completely rent free for almost 2 years. During this time the child has not even saved up any money and has still not bothered to move out.
This is a true story of someone I know quite well. This saddens me and also really pisses me off. Enabling somebody does not help them one bit. You are hurting them by not letting them deal with their own problems. When you do everything for someone they never learn how to take care of themselves.