Can my son block me from finding him with my find my iphone app?
Yes - your son can block sharing of location in several ways.

The best you can do is enforce restrictions on the device to prevent changes to Find My Friend / Location settings, but if your son is savvy enough to know to hide location, they will be savvy enough to:


google a faraday cage and put the phone in aluminum foil
enable airplane mode
powered off the phone
sign in to an iPad somewhere else and shift that to report their location when they choose


Here's what the restrictions look like and I've heard of good luck just talking over the restrictions with a minor and then agreeing jointly which will help them avoid temptation and which you can graduate them past with trust in the relationship.



At some point you'll need to find another avenue than technical measures for tracking or have an agreement that if you text he has so many minutes to get back to you, etc...