A G.S.M. is an expression of a Place. More so, it is an expression of a place at a individual time. 
Think of who you would have been if you grew up in a different household. Didn't take that trip. Didn't go and do that one thing that set you down a course leading to who you are today. 
Moments like this matter. Moments and Places nudge and direct us into the paths we take. 
A G.S.M. is the harmony 3 different grapes brought together in a specific way to tell a story. 
Individual, each one of these wines is stupendous. Yet the Harmony of the arrangement, the place, the year, is what gives it soul. 

Example, Paul McCartney is an amazing musician and songwriter. But without George, John, and yes, even Ringo. You get "wings". With the collaboration, with the harmony, you get something that endures, something that changes everything that comes after it, something, that every time you revisit it, you find something new and wonderful.

Welcome to the Family Tree.

This wine is the unification of our Vineyards, our Style, and our Work.
We have brought together:
A Barrel from each of our Syrah Bloc's : Fatman / Little Boy / High Hill 
Barrels of our Grenache from each of our Vineyards, Windmill and El Camino Real
and Finally 3 Barrels of Mourvedre from our El Camino Real Vineyard

The total is balanced:
6 Barrels from Windmill Ranch 
6 Barrels from El Camino Real.