nightc1, I tend to agree with your general point that perhaps he shouldn't do something that will result in several hours a day not spent at home with his family since the kids are so young. I can't see why he couldn't at least do part of his commute by bike tho. Especially if there is a portion where riding wouldn't be a huge difference time-wise from driving, like through an area with lower speed limit and/or heavy traffic he could filter through.
Also, I am sure the stress relief from riding, and being in better health, would make him more effective in his parenting role.