The son was using his phone or the neighbor's router so the parental controls had to be done on the PS4 and not the router. Link about:

"If children will be using your PS4 system, parents or guardians can restrict use as necessary. To restrict use of PS4 system features, select (Settings) > [Parental Controls/Family Management] > [PS4 System Restrictions]."
Read more at https://www.playstation.com/en-us/network/legal/ratings/