The family of the British girl killed in Italy expressed dismay that the original evidence was unreliable and has accepted that Amanda Knox may be innocent after all.

Is this really true? It isn't reflected in the quotes that I've read so far.

Indeed it isn't -- what they have said is that they plan to support the prosecution's appeal of the acquittal. (In fact, as the Italian system allows, they are actually a party to the case, seeking a monetary judgement against Knox and Sollecito. [This fact should not be confused with the recent false reports that they were planning to sue Knox in another jurisdiction.])