Plot Holes

C'mon, if there were no plot holes it wouldn't be Doctor Who. They're one of its finest traditions!

And anyway, Amelia doesn't say that her parents are dead, just that she doesn't have any; and doesn't give any reason why she moved to England, just that she did and it's "rubbish" - so she may have moved there with her parents prior to their ceasing to exist, and her Aunt may well have lived with them before all this happened.

Although, if we're being pedantic, the fact that her parents no longer ever existed should mean that she shouldn't exist either since if they'd never existed nothing they ever did - including creating Amelia - would never have happened.

Surely the conclusion we can draw from all this is that either a) it all makes perfect sense but is far too wibbly-wobbly and timey-wimey for our feeble human brains to understand without having to ask the Doctor, or b) the whole thing is and always has been so completely riddled with plot-holes that they're an integral part of the show and not to love them is not to love Doctor Who. Take your pick.