Kids definetly put a squeeze on the time commitment...my 4 year old son likes tooling along on his bike when we ride around the block...and he always asks me how fast I went when I go the road alone...kinda fun impressing junior while he is still easily impressed!
My 1 year old daughter likes the trailer, I think...she sits quietly staring out the front...
My wife is patient enough to let me ride the MTB trails once a week with the guys from the office, but road time is either at 6a Saturday, or before the kids and wife get home...