I have a 2 year old daughter who I have to line up a babysitter for in advance, and my plans have fallen through more than once because of the rivers not cooperating on those days.
I started taking my kids with me in a DB when they were 4 and 6. Of all the boats I've owned, it was the best and safest craft for small kids due to the it's canted high gunnels. Because of this, my wife often encouraged me to fish, even if just to give her a break. In a DB I also felt comfortable enough to take some of their small friends, many who now account for their love of the sport due to their experiences on the river and in the salt in this craft. Because of their early boating experiences in the DB, my kids were also able to successfully transition to other watercraft quickly. Best of all, they also became great fishing companions sooner. Although it wasn't always BIG fun to start with, we still cherish the memories we made together and I continue to reap the rewards of that investment today with the occasional front seat. A DB may not be the ideal craft for where YOU want to fish today, but my best recommendation to any father would be to consider a craft that will bring you and your kids closer together today for an even greater fishing experience tomorrow.
All the best.