3rd son of Alexander Corvenius?

In the first Underworld Victor I believe states Alexander had 3 sons. One bit by a bat, one by a wolf but what became of the 3rd one? Or did I miss something?

one by bat.....one by wolf.........and one normal human son. It is the descendent of that Corvienous son they are looking for in the first movie. He was never a Lychen or Vampire........his blood is the pure Corvenous blood that would accept either or both as you see in the movie.

Makes sense now. I wonder if the unamed son had any special abilties or anything? I always thought the 3rd son was immortal also like Alexander was. Maybe in the 3rd movie they will clear up some of this stuff. It's possible he may be alive yet.