there was a buddhist mamas thread, but it became inactive. this question came up, and mamas had many different experiences--very welcoming to children, special occasions welcoming, and less welcoming. that is, less active in making children a part of the community.
have you checked the dharma center search tool on
tricycle? maybe there is another community near you. (scroll to bottom of their home page)
you might find this resource helpful, lots of
family sangha links
mindful kids might have info you can use at home in the meanwhile
good luck in your search