Not consistently going by the information I've seen.   There were censuses done every 5 years in the UK through much of the 18th and 19th centuries and so you knew who was living where because the census-taker would go house to house and write down who was there, their place in the home/family and their age.    There were a lot of people living in homes together as a big family unit, whether in fishing villages or on farms that were under the Lairds.

It's true that younger sons often went off to join the army and so on, but from what I've seen, they sometimes came back -- perhaps after being injured, for example.   There was a lot of both.  The economic environment had a lot to do with what happened.

The degree of "independence" expected seems to have been adjusted to circumstances, whereas today it's almost as though independence is expected regardless of the environment, which is interesting.