who was Jacob's great grand father?

It's c, ephraim black.
Because in the movie twilight, jacob says when him and Bella are talking on the beach.

c.Ephraim Black he was the alpha of his pack

C. Emphriam Black
It is Emphriam Black because in the movie he is the leader of the lobo pack jacob even dicho it in the movie on the playa to bella

ephraim black answer 'c'

Ephraim Black answer c!!!!!!!!!!!!!

I amor JACOB!!!!!!!!!!!!! I have read all of the libros and watched all of the cine even breaking dawn part two like 100 million times and I am only 12

ephraim black

C