[TheEndIsNigh]

Well wasn't the grandaughter was dumped on some planet way back when. It's not hard to imagine she's still going strong however given the number of new doctors she will have 'changed' herself. I thought the mother of the grandaughter was dead and anyway there is nothing to say the relationship wasn't via a son. Which will be the way they can extent the series after the twelfth transformation. You know as the doctor lies dying who should appear but the son who has secretly been hiding in the inner mazes of the tardis doing jigsaw puzzles and practicing his knitting (where did he get that scarf). I mean it had to be from a very close relative to make anyone cart that around for so long.