An update on the cello situation:
We've been told that if it were to be repaired, then we would have to spend exactly what it would be worth afterwards. Dad doesn't want to bother.
Mum suggested giving it to the workshop where she made Little Blue, so they could use it for demonstrations on how to fix broken instruments. I told them that how much it would be worth would hardly matter, once it was fixed, because I wanted to play it, not sell it. Dad ignored this reasoning, because I've been needing a full size cello for a while now.
My only response to this was, 'I don't want a full-size cello: I want Red.'
To which Dad replied, 'What on earth is "Red"?'
This is my answer (and sorry the last picture is so big - I didn't actually realise it until I already had it uploaded. I am such an idiot sometimes):
The big crack, where the back came off.
Ditto above.
Ditto above, again.
Er... ditto above.
The smaller crack in the face of the cello. It might be a little hard to see, but it's that really light stripe next to that big black part (I honestly can't remember its name right now).
Ditto above.
The broken strap.