[devilsadvocate]

Since you can't do both, I'd vote for you to coach your sons. You can help get good umpires, you can help train good umpires, and you don't need to be the UIC to help with that. Having quality umpires is important, and I'm sure that you can have a positive impact on that aspect of your league by assisting the UIC.

Your kids, on the other hand, may never be on the same team again. I would see this situation as a wonderful and special opportunity that may never occur for you again.

Even if the league does need you more as a UIC than a coach, be selfish. Spend this time with your kids. I coached my son's football, basketball, and baseball teams for two years. This year I didn't. I really missed that time we spent as a player/coach and father/son. However, I do have the memories of the past two years, and those memories will be with me for a lifetime.

You can always be the UIC next year.......