My DB’s daughter who is 13 is very wasteful. For example if we do a buffet she’ll put 20 prawns on her plate but eat 3. My DB laughs and doesn’t stop her. We had some fruit out, cherries so expensive, she filled her bowl, didn’t eat them all but others missed out. Of course cherries were easy enough to rinse but she will put her eaten stones on top.
I did a sushi buffet she got 6 gyoza and just nibbled the pastry.
DB does spoil her, she has all the latest fashions etc. I have DDs who are 9 and 12 and they do look up to her in a way, but even they are sometimes shocked. If DB and SIL won’t do anything can I say something?