Jason,
There are a few dads out there, like you, that race and continue to ride when their kids are riding and enjoy the sport in a different way than just mechanic and coach. I love riding and sharing memories with my dad even when he's 68 now and we go riding weekly still all summer and follow it up with a cookout. It's fun, great family time, and we can talk about the track, lines, and how to get through sections even now. I love having my son ride with us too and hope he's still dragging me out to the track when I'm in my late 60's and forcing me to still ride. Of course my dad still offers me advice on where to go on the track and how to go faster after all of these years of riding, and I enjoy his comments because he still cares about my riding and I'm going on 44 this year.
No matter how you are involved with your kids riding, if you make it fun, they will enjoy it and continue to do it. If you make it work and harp on them, they'll find other things to do with their time that don't include dad. So just have fun with it and enjoy the time with your kids as it will be gone before you know it.