Everyone who says – this is my way/minhag to run seder – should actually read the Hagaddah. There are four sons – and each of them has a different personality, different questions and requires a different approach. So, unless you sent your kids to the same teachers and trained them to ask same questions or, lo aleinu, sit quiet, they are going to ask different questions and you will have to talk about afikoman halochos with some of them, get into teeth with the other, talk about feelings with the third, and make the fourth one interested …
the two approaches offered above: let them read DT written by someone else or lecturing them – will, of course, make your life easier, but this is not what the seder is for.