5. Pro: No family surprises
Whether you like it or not, your significant other’s family is going to be a part of your life and in many cases, they become a very big part of your life. Since the chances are pretty good that you have already met and gotten to know your best friend’s family at least a bit, the likelihood of nasty surprised is lessened. Relatives and the problems that sometimes go along with them have been the cause for more than a few break-ups.