OT: looking for a small group curriculum for grades 6-8

Do any of your children belong to a small group? We are looking for ways, other than youth group, to allow our oldest son to combine some Biblical based instruction and socialization in a similar fashion to our adults small group. There are a number of kids/families in our area from our church who I think would be interested in participating, most of them are in the grade 6 to grade 8 range. I was wondering if anyone has this kind of thing happening and what they are using for curriculum. I was kind of thinking it might be almost a relaxed co-op type situation, so someone might have used something for that which would be good. I’m not sure if I’m getting the point across the way I’d like. Sorry.