User blog comment:Master Sima Yi/Assassinews 19-07-'13 — Assassin's Creed: Brahman announced/@comment-92.25.10.79-20130902192752/@comment-1888015-20130902215857

It could only be possible if Adewale had a kid when he was 17, but since his genetic memories are going to be playable in Black Flag's DLC material, I honestly doubt it.

That's not stopping Achilles from being a younger brother, but even so, it's not likely that they'd know of each other.