FIRST-TIMER HERE!!! I'm a huge Alias fan, I've caught up with all of the episodes and can't wait for the next one. In my opinion, Sark secretly knows that Irena is his mom, but Irina doesn't know that Sark knows. Sark has studied up on his family and also realizes that he and Syd are also siblings. When he said "we're destined to work together" that obviously meant that something would happen in a future episode. And I want a put an end to the whole Vaughn and Sark are brothers, cause that's kinda OUT THERE. But the one big "not so happy" family is Jack, Irina, Sydney, and Sark.