Jason Stevens

Jason Stevens was the son of Peter Stevens in Vault 87. On the Vault 87 Medical Records Terminal, it shows that he died for an unexpected reason. Possibly, he died because he was exposed to the FEV virus and the Overseer had to cover it up. Learning that his son was dead, Peter Stevens eventually went insane, claiming to hear 'children's laughter' in the outer tunnels. This might have been the Little Lamplighters in the caverns.

Both Peter Stevens and Jason Stevens do not actually appear visually in Fallout 3, but both are mentioned in the intact files on some of the Vault 87 Terminals.