Hellboy III: Siblings of Destruction

On December 23 and December 24 two unique and demonic children were brought into this world. Hellboy and Liz created a family and decided to give the B.P.R.D another shot. So, they go back to living there with their two kids, Lillian and Alistair. When they're teens Nuala forces Nuada to accompany her to see Abe. She would usually go by herself, but she wanted him to learn to accept her and Abraham's relationship and get to know her fiancé. That's when he gets to meet Hellboys children. But, since they have Hellboys DNA there's a chance one of them could be the bringer of destruction for the world and complete the task their father never could: Bringing about the Apocalypse.