Most (reasonable) adults have either had children or have been around enough of them to know that children throw tantrums. As far as proving they're yours, how many millions of photos are on your phone? I have a friend who's child was misbehaving in a restaurant & she was "taking him to the bathroom to discuss it" and he screamed very loudly "NO, DON'TBEAT ME, MOMMY!!" on the way. No one called the police, of course most of them had been witnessing his behavior.
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