Steven was Eddie Winter's cousin.
Eddie once asked him to threaten a cop, which he did. However, he also ended up blasting the cop in the face with a shotgun, angering Eddie. In his ninth holotape, Eddie talks about not wanting to take Steven with him and Claire Pozinski on a trip to Ireland, and that for all he cares, Steven can rot in an abandoned fishery on Union Wharf.
Steven is only mentioned in Fallout 4.