It may or may not be eidetic memory, but it certainly is a skill level far beyond what is typically expected at this age. I recommend you start an account at http://www.talentigniter.com/milestonetracker
to help you recall the various milestones as they occur and get an idea of how far ahead of the curve he really is. Also try and collect some family histories of other family members who did things unusually early and how life has turned out for them in areas like school, social interactions and work.

Welcome and great to have you here. You belong.
Grinity

Coaching available, at SchoolSuccessSolutions.com