1) Spoiling kids 
There is no doubt that parents love their kids and want them to have all the things they didn't. However, this comes at a price. A ton of well-intentioned parents have ended up spoiling their kids to such a degree that the kids aren't even happy with all the stuff they have. This causes them to never be satisfied and always want more. Junior doesn't need one more piece of crap, what he needs is some special time with his parents. Think of it this way: How will they ever be prepared for disappointment throughout their life—or learn to be thankful for anything?

2) Inadequate discipline
When you're too lazy to adequately discipline your kids, you pass the little devil you've created on to your relatives, coaches, teachers, and his friends' parents. It's not OK to let your kids treat your house like it was a Jump Planet because that's exactly how they'll treat other people's homes. They should also be much better behaved when they leave the house and visit elsewhere. I've lived through this nightmare first-hand, with the same kid at my house treating my $1,500 couch like a trampoline, and then calling my daughter "ugly" while the kids were eating dinner. All within a 15-minute span. If you don't discipline your kid, someone else will—and you won't like it.

3) Failing to get involved at school
School is where your kids will spend more time than any place besides your home. It's also the place that will have the most responsibility for shaping their life—from teachers and their peers. That being said, how can you not want to be involved in what's going on there? It doesn't matter if it's you or your spouse: Your family needs to have a presence at that school. And don't use work as an excuse—take a vacation day if you need to. You'll see immediately that it's time well spent. You should also have at least an e-mail relationship with their teacher. It's a great way for that teacher to see that you're interested in your child's development, and the teacher can alert you to anything concerning that may be going on with your son or daughter. Your kid's teacher may take a much more active role with your child if they know you're keeping close tabs.

4) Praising mediocrity
While we all want to encourage our kids to do well and build their self-esteem, there is a point of going too far. Building a child's self-esteem is great, but having a big party for a mediocre accomplishment skews what they view as a real achievement. One big place I see this is in sports. A participation trophy for anyone over the age of 6 just ends up devaluing the meaning of a real trophy. It's happening in my own household. While I was against trophies for my 7-year-old son's basketball team, a few moms overruled. My son has played exactly four seasons of sports and has earned more trophies than I did in my 40 seasons growing up. Something is out of whack.

5) Not giving kids enough responsibility
Your kids shouldn't be expecting any payment for doing chores around the house. It's a home, not a hotel. That being said, an allowance is a great idea … for extra work. They should be pulling their weight as part of the family. If they grow up without enough responsibility, how in the world do you expect them to hold down a job, or get through college? When they get "of age," make sure they're taking some of the burden off you around the house—from unloading the dishwasher to picking up dog poop in the backyard. While they're not your slaves, they sure aren't on vacation, either.