My MIL has been looking after my DD today, and she knows that I don't have any sweetner at all (it makes me feel ill), and she also knows that i don't want my DD having any (there is no need, she is only 2.4).
So when i got back she went into the kitchen and came back with a half drank bottle of flavoured water, and asked it if was ok for her (DD) to be drinking it (after she had already clearly drank half the bottle!!!).
I kept calm and told her i'd prefer it if she tipped that drink down the plug and refilled the bottle with plain water - which she then did.
But AIBU to assume that she wouldn't/shouldn't give DD sweetner in the first place?!!?