I am married, 2 boys with one more on the way, boy again. I also work full time as a construction manager, which sometimes takes 12-16 hrs a day.
I used to play FFXI for almost 5 years and gave up so I can pursue a career. I was single at the time.
Now, I play usually 3 days during the week, from 8-11 pm. Weekends are on and off, depending on how much work I get done around the house.
A few people mentioned it, the most important thing is let your family know
you they come first. Try and schedule your play time, because if you don't, they can't schedule their family time with you and they feel left out.
If you manage to find a way to do it all, it will work out. Also, as someone mentioned this as well, you are not out there partying and cheating on your woman, you are in the basement glued to a computer trying to kill a NM
Balance is key, even though you can play 24/24 and not get bored.