Yeah, right. I guess Lee is Connor's father too. Beside UBISOFT love to play with History. I can't find anywhere on the net what Lee did in 1753. Not even in Wiki.
But Wiki stated this:
Maybe he did something bad in Mohawk village which related to later events in the game so they have to start with 1753.His wife (name unknown) gave birth to twins.
By the way, Lee was known to the Mohawks as Ounewaterika, or "Boiling Water". This picture made me believe it was a very right name for him.