What is the most insulting thing your child has ever said to you?

my personal experience was my youngest sister-in-law and at dat point she was only 5years and my 1st born is less than a month. she came to my room and saw my child crying while i was changing her diaper. she clearly say "mummy, u dont knw hw to take care of yr child ya" fyi- my sister-in-law does call me mummy..till now..bt wat i meant to say that point wen she just walk into my room and commented such..i feel like telling her off bt again i knw whr she learn or heard those words frm..so didnt blame her..blame the parents who input those words to her..