Who is the tallest wolf pack member in the twilight movies?

it is Sam Uley at the beginning but Jacob soon grows larger than him.

extra info:

Jacob should be the alpha leader because he is the direct descendant of Ephraim Black, the last Quileute chief. In eclipse, Sam Uley offers Jacob the role but he denies it.

In breaking dawn, Sam becomes annoyed with the Cullen family and quickly judging plans to attack the Cullens on their territory when he believes that the Cullens have changed Bella Swan into a vampire going back on their ancient promise. This is what prompts Jacob to step up to his job as Alpha.