One of the hardest parts of parenting is, in my experience, discipline. Deciding who will be in charge, what tactics you'll use, and how to hold your own when the going gets tough is a lot easier if you and your partner make the decisions together. If you're the sole disciplinarian, or if you're the one saying, "Just wait until your dad gets home," tensions can rise between you and your partner. So while every family is different, there are more than a few things that happen when only one parent disciplines the kids. For the record, those things aren't all that positive.
My partner and I had something of an unspoken understanding when it came to who did what on the parenting front. I'm not sure discipline was something we ever discussed aloud, either. Since I was going to be the stay-at-home parent, doing the bulk of the child-rearing, I naturally became the so-called "bad cop." What my partner and I didn't realize, though, was that this set-up would end up negatively affecting every single aspect of our lives, from how we were doing as parents to how we felt in our marriage.
We've tried to come together as a team over the years, but when it comes to discipline our kids have been somewhat conditioned to do what I say and ignore what dad says. So however unintentional the distribution of discipline responsibilities may be, here's what happens when only one parent leads the charge: