no, it has been said that he "exits the vault as it's only survivor".
this would also be true if his wife and kid, like, left a week earlier, so this isn't necessarily the same as "he was the only one who survived".
so, careful you don't celebrate your freedom too early, your spouse might be watching from behind some bush...
well, technically, there were kind of six slaves in both fo3 and fnv:
in fo3, there was that hugh hefner style dude in that hotel near the river (ok not slaves exactly, call them bunnies ,
and in fnv, there even was a quest where you'd take a forced prosttute to freedom - and there were quite a lot of assets for caged babes in the game files, but haven't been used much, probably were and got censored out though