Finally they reached Wesker.
According to Revelations 2, however, the other 11 Wesker kids are all dead.
It turned out that he was one of 13
children who were products of Umbrella's secret“Wesker Project,” which was named after its chief researcher.
That being said, HCF, Wesker's mercenary squad from the same game,
was mentioned in Resident Evil 7, and that's far more obscure than Steve was.
That would be it for Steve, except his body is subsequently stolen by Albert Wesker, who tells Claire that there's a chance Steve might come back from the dead someday,
just as Wesker himself had.
The next time we see him in series continuity, Wesker is incredibly rich- he has
his own personal stealth bomber in Resident Evil 5- and has been quietly selling bioweaponry to dictators and lunatics around the world.
Since both of the Weskers shown in the series so far are brilliant mad scientists with personal body counts like a natural disaster,
it could be inferred that the other Wesker kids would be similarly gifted and/or damaged.