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 wolf pack jacob even said it in the movie on the beach to bella

ephraim black answer 'c'

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

I LOVE JACOB!!!!!!!!!!!!! I have read all of the books and watched all of the movies even breaking dawn part two like 100 million times and I am only 12

ephraim black

C