CEC provides an inclusive space to sit in community, and so much more.
check out: http://cecmeditate.com/
Elli is a lovely teacher and her site has wonderful resources:
Dr. Shelley Murphy has created a list of mindfulness books to read with children.
Dr. Shelley Murphy also recommends these books for teaching mindfulness.
My favourites! Also great for taking mindfulness with you wherever you go.
To understand the core of yoga or mindfulness I recommend the above.