When short for time, it is hard to fit in a meaningful exploration of Paris and a taste for another region of France while still meeting the wishes and needs of all family members. As I often travel with my own family through France, I am intimately familiar with the logistical challenges, and have first hand experience on what works and what does not, what costs money and how you can save some. My trip of the month suggestion has now been updated with two detailed trip outlines, all priced, for family travel http://www.experienceauthentique.com/tripsuggestion.asp . Two combos to consider: Paris & La Rochelle/Ile de Ré, and Paris & Loire Valley by bike.
Consider travelling when oversea flights are at their lowest point, and crowds are small; March break is a perfect time slot to enjoy quality family time in France.