Not an uncommon story. CPS will come investigate any complaint made about a possible child endangerment situation. My guess is one of the boy's friends have anti-gun parents and they saw the photo and reported the family to CPS.
This happened to my Brother-In-Law. He had a neighbor who bought a house 3 doors down from him. The property had originally belonged to my Father-In-Law and he subdivided a portion off and sold a few one acre lots with road frontage. Anyway, this guy bought the house from the previous owner. The property behind the house still belonged to my Father-In-Law and my brother-in-law's boys all rode motorcycles back there on the remaining 10 acres. The new neighbor didn't like this and called CPS because the kids were 'in danger of getting hurt' riding the motorcycles. CPS came out, and luckily the lady that showed up went out there, looked at what the kids were doing and said 'Man, I wish I had a place like this to ride when I was a kid; that would have been great!' She told them she would handle the endangerment issue. After that the neighbor tried all kinds of things to get my brother-in-law's family in trouble. The sheriff's department finally just quit showing up to take reports if it was something related to my brother-in-law and threatened to arrest the guy if he made any further false reports. Finally after a couple of years the guy moved.
