I'm not going to go trawl back through his twitter feed to find it, but SimGuruNinja has said that Parenthood is not Generations for Sims 4, and should not be taken as a sign that they're never going to do it.
That doesn't mean that they will do a Generations for Sims 4 either, but Parenthood wasn't intended as a replacement for it.
I mean, other than some more activities for kids/teens which could be satisfied by a School Daze pack (game or expansion), I don't actually care if we get a Generations pack, other than letting realism players move on to demanding something I might actually be interested in - like cars or bands. But I'm not writing off Generations because of Parenthood.
