I know of one guy in family that was from vtech who uses his older alts to spy and stuff, and I encountered another guy who would occasionally boost his own points with an alt, but it was never to "win" a battle I only ever saw him do it when no one was attacking (i.e. we had taken one or 2 zones already with no response).
I disagree with shooting your own alts or using opposing faction friends to boost your own score in general and think it should be punished if witnessed or "fixed" etc, but when it comes to spying on other factions, before that one guy, we didn't have spies, or even a TS channel so spies against us were one of our biggest issues, now that we have at least one, the playing field seems more even.
But if you mean vtech and family actually working together I have never seen it, though that doesn't mean it hasn't occurred. The "former" vtechs I readily accepted into the fold as did many others as we needed fighting numbers.
Aside from that i'd say 99.9% of vtechs (or any non family faction for that matter) I have shot on sight, the 0.1% was when a player from an opposing faction specifically identified themself as someone from family playing an alt, but even then i've seen them get shot just as mercilessly.
I know lawyers are supposed to be our direct enemy, but that never stopped us getting decimated in our own turf by both vtech swarms and BBoy rape squads whenever we tried to compete, so it's hard for me personally to ever consider a cross faction truce.