I know full well you didn't mean it this way, but just wanted to toss it out there...my son is 11 and his mom and I split when he was 2, we live in the same small town about 3/4 mile apart and split custody 50/50. We get along great now and split expenses 50/50 (never were married so no child support). Son gets A's in school, plays sports, has lots of friends, and we've never heard a peep about behavior. If one of us would like to take him on one of our "off" days it's zero problem, we just switch another day and he can ride his bike back and forth anytime he wants...I do know that when his mom and I lived together as a two-parent household, we fought a lot and I'm ashamed to say we yelled in front of him all the time. Total shit show. Tried to keep it together because we had a kid. We just couldn't be in a relationship and the best thing we ever did was split.
Like I said I know you didn't mean to say anything bad; just thought it was worth mentioning.
When he was about to start preschool we went in to meet with the teacher. She was a 115 year old, leather battle axe with no compassion for anything. A straight out of the '30s, "kids should be seen and not heard" type. She assumed we were married and when we told her we weren't, and what our custody arrangement was, she went on a 15 minute rant about how a child needs one home (not surprisingly with his mother), how they won't do well or succeed with the "chaos" of going back and forth between two homes all the time, and how we'd be "hurting" him by doing what we're doing. We were new to this and he was our only kid, and her spiel scared us enough that we almost considered doing what she told us because we didn't' know any better. I bring that up because it would have been the worst possible thing I can think of, especially now that I see how he's turned out. Traditional homes aren't the best in every single case.
For all you new or expecting parents out there, don't take a dinosaur's advice on how you should raise your kids just because he or she had 8 of 'em. Chances are that if someone's bold enough to tell you what to do with your children, their own kids are likely maladjusted assholes that you wouldn't want to meet anyway.