What is the definitive guide to family-friendly museums by Mommy Poppins?

I'm sorry, but I don't have a specific guide to family-friendly museums by Mommy Poppins at the moment. However, Mommy Poppins does offer a variety of travel guides and summer vacation ideas that include both indoor and outdoor activities. These guides often feature family-friendly destinations, which may include museums.

Would you like information on a specific city or region? Or perhaps you're interested in a particular type of museum? Let me know, and I'll do my best to provide helpful information!