My DD12 is a big eater and honestly can be quite greedy. She has often tried to take more than her fair share when sharing food with her sister DD11. This weekend, we ordered takeaway and there was a side for the two of them to share. Typically they will divide the side up to start with so there are no complaints about either of them eating too much of it. However, we were in the middle of watching a movie when the food came. I told DD12 to divide the side up and she said "oh, it's ok, we can share it reasonably" and I said fine since we were in a hurry. Maybe 10 minutes later I look and she has eaten all but 2 pieces of the side (out of 30 maybe?). I ask DD11 if she's had any and she bursts into tears and says no. DD12 says sorry repeatedly and that she didn't mean to do it.
It wasn't something that was easy to rectify at the time, so we said that DD12 would owe DD11 something. DD12 is in secondary school and gets an extra pound or so each week to spend on a treat at lunchtime on Wednesdays. AIBU to tell DD12 that she needs to buy the Wednesday treat and bring it home for her sister tomorrow? If there is a better suggestion, please let me know!