In my view, the food at Rene Pujol is better than Le Madeleine's, and the ambiance is nicer. As far prices go, even if Rene Pujol would cost more, I think it's worth it. However, you may have certain budgetary constraints, so the best thing to do is to check the prices on their websites and compare.
I've been a regular at Le Madeleine for years now-it's my pre-theater spot. I've always enjoyed the food and the atmosphere...solid, good value.
That said...3 generations? I don't know the top age, but-If you are going pre-theater, it is quite loud and the tables are close together-the garden room is a bit quieter, but still loud.