To begin, we'll start off with his childhood years- you know, 0-15 or so.
These years are marked with the spin off series of Sam Gladiator's Yandere Highschool, which was a kindergarten version.
According to the wiki on this particular series, it was considered non-canonical to the actual canon-series, Yandere High. (We'll get to why that's canonical later)
However, there is something interesting we can draw from the series, as this is where Grian meets Sam & Taurtis, who we'll see more of later. Also, in this series we learn that Grian is a child of divorce, whose parent's reportedly 'don't want anything to do with me.' (Direct quote from a clip. If I can find it, I'll link in comments)
Oh, yeah, and they're rich- according to Grian, after they'd abandoned him in Japan, they'd send him money monthly.
Do with this information what you will- perhaps personal head canons or requests for one shots and such.
Link to the series, if you'd like to watch (check comments):
Did I forget anything?:
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