There was a situation similar to this with me when i first moved in with my mum when i was 11, except the money kept going missing...

Mum asked everyone else (i'm the second oldest of 8 kids but there were only 6 of us at that stage) if they took the money and they said no, so one day i got home from school and mum went OFF!!! I had NO IDEA what she was talking about, she just kept yelling at me and telling me i was a theif and "no one else took it so it must have been you" and in the end my little sister (she was 9 at the time) was caught flashing around a whole bunch of money at the shop down the road, i got no apology or anything.

I'm not saying that you will handle it as patheticly (dont even know if that's a word) as my mum did, i'm just saying that sometimes its not what it seems