My dd 16m bit an older child (around 2/3 I guess) - the girl was just standing there with a watering can and my daughter wanted it - the little girl wasn't giving it up - rightly so she had it first and didn't want to share - my daughter got frustrated and bit her hand. I realised and said you must not bite the girl - she ran to her mum and the mum said yes she had bit her in an off tone and then said she was going to get the girls Nan. The Nan came out and was tutting at me. When my daughter had calmed down I got the water can and gave it to the little girl and told my daughter we are giving it back as the girl had it first and that biting is not kind - also asked her to say sorry and that you hope she is ok (obviously she didn't understand any of it)
What would you have done in that situation - the mother and grandmother made me feel so crap - 😩