Hello!
As Diezel said, you do have the right mindset, and it IS awesome you are setting a good role model for your kids. I understand your frustration with the six pack thing. I wasn't blessed with one, and I had to work my butt off to get one, but I finally was able to achieve the look I wanted, for the most part! (Are we ever REALLY satisfied????). Anyway, I'm not sure what level lifter you are but, I tell my clients success is based on 20% work, and 80% nutrition. That being said, as long as you are working out consistently, you should take a HARD look at your intake. The first 10 pounds of fat loss are relatively easy. The last 10 is where the most effort comes in, but you will reap the biggest rewards! Unless you are genetically blessed, taking that last bit of fat off your midsection will take strict diet and good, smart cardio.
That's my 2 cents anyway. Good luck. And remember, it's a lifestyle change!! But it's important to set goals within that lifestyle.
Cheers!