His Forgotten Brother - Divergent Fanfiction

This is a 'What If' fanfiction.
What if? What if Tobias 'Four' Eaton had a brother. If Evelyn had a baby boy before she 'died'. Tobias' brother is 3 years younger than Tobias. Samuel Eaton is devastated after his big brother left him with the monstrous father; Marcus Eaton.