Here are some resources for Ancient India. It’s not a comprehensive list, and I recommend reviewing materials before you use them to make sure they’re appropriate for your family.
I found it very hard to find any concrete history books about the Aryans and Mauryan Empire for younger children. Most of what we read were myths and folktales.
**Please preview materials to make sure they are appropriate for your family**
Ancient India (in general)
India: Exploring Ancient Civilizations
Exploration Into India
Hands On History: Ancient India
National Geographic Investigates: Ancient India
Everyday Life in Ancient India
Science in Ancient India
India (Ancient Civilizations)
Ancient Indians (Crafts from the Past)
Indus Valley / Harrappan
Aryans / Buddha
Myths / Stories