User blog comment:Master Sima Yi/Assassinews 25-03-'13 — Assassin's Creed IV: Black Flag gameplay trailer/@comment-4519956-20130412151703/@comment-4519956-20130413164342

Correct me if I'm wrong, but Jenny told Haytham that their father didn't know about Reginald. The only time he knew was during the argument that happened the night before the attack.