America actually has this weird cultural thing where living with your parents past 20 is seen as a badge of shame. You might have heard the "nerd in his parent's basement" stereotype a few times. The conservative families I know do have the "family values" thing, but they also have a huge "independence" thing. Most of them don't want their kids still in the home after they hit adulthood. They do tend to want to be near family, though. Obviously this is anecdotal evidence and should be taken with a grain of salt.