Well, there are several groups you might check out. The only one I know which includes children is the Riverport and Area Community Choir, which performed at the Lunenburg Folk Harbour Festival last weekend.

The local groups, Chebucto Community Chorus, Aeolian Singers and Cape Breton Chorale, are all groups which have a folk repertoire, mostly of Cape Breton/Nova Scotia/Maritime music. However they don't include children in the group.