Abbysmum said "Could they have been a family unit? We went to the park the other day with our 5 kids. It might have seemed weird, but we're all one household, so there's no one to "bring it back to". We picked a park where no one else was, stayed 20 minutes, then left. "
Doubt a family unit. All three had a different last name. Plus you have the interaction with the photographer so who knows where he has been too. Understand what you are saying I will be fishing this weekend. Last I want is some public photographer interacting with me.