mil bought bag of chips to our house (why can't she eat them at home) and dd was straight over pointing. mil said let her have some, they won't do her harm. I told her no cos they are bad for her, covered in salt and she already ate her dinner. She just kept going on saying let her have some. After literally 10 times I snapped NO and all went quiet. We are trying to get dd to eat dinner with us at the table and to me she is undermining the rules. AIBU