Unless he pays mortgage and utilities and property taxes and home owners insurance etc or rent and utilities etc (substantial not just a bit) , he actually is dependent on his mom. If not her, he’d have to pay his own way and I am sure it would cost much more. When adults say “I live in my parents’ house but I don’t depend on them”, I want to ask let’s look at your bills and what your bills would be if you lived completely alone. Not even comparable. So yes he depends on his mom.