This community has had fairly infrequent postings, but those that I have seen have mostly been about setting boundaries between our fannish activities and our kids. We've discussed how to keep some of our fannish pursuits away from children's eyes, who to explain without explaining too much, etc. I think those are reasonable things to discuss and boundary setting is important.
Still, there's another side. It's just sooooooo lovely to share fandom with one's children. In the past few days I've re-watched 4 Star Wars movies with my kids, watched some songvids with them, and read my youngest a fanfic bedtime story.