What's Up,
This is big dru, I see no brothers have replied yet so I'll give you my opinion. Living with each other before marriage might save you a divorce, cause when you live with someone from day to day you get to the real sides of him/her because they can't hide it 24/7 it's easy to put up a front when you'll spending the nights but when you there every day and paying bills together you start to see what can of man/woman you really got cause things like cleaning and bills really test a relationship so live with the brother first take away his opportunity to have toys at other places because he have the same place to come to every night and you just might save yourself a lot of heart burn.
Big Dru
Hopeful Sigma