This is earth but not the earth of Rose’s universe; that’s immediately obvious if you look up. Rose’s earth has planes, not zeppelins. Somehow the TARDIS has catapulted them into an alternate universe. That’s a pretty big problem, because the leap across the void hasn’t done the Doctor’s space and time ship any good. She’s dead.
Judging by the advertising billboard Rose is staring at, the same can’t be said of her father. In this universe he’s alive and well.
It’s a shock, seeing his face, hearing his voice, but this isn’t her world. This Pete Tyler isn’t her dad.