Fish: another thought would be to "drive" partway there and then bike commute the rest of the way in - if there's a safe place to leave your car all day. Don't know what your work schedule is like but (when I deem the weather is warmer) I ride on my lunchbreak. I get an hour for lunch so I can get at least a 45 min ride in with the extra 15 min for changing and freshening up. Would that be doable for you??
Also: does your DH ride?? If you could get him involved you could get trailers and ride with your DH And your kids - then you don't have to feel guilty or leave anyone at home.
Life should NOT be a journey to the grave with the intention of arriving safely in an attractive and well preserved body, but rather to skid in sideways, champagne in one hand, strawberries in the other, body thoroughly used up, totally worn out and screaming: "Yeah Baby! What a Ride!"