My ex has just picked up our child (toddler) for a handover (from my house) and he was either still drunk from drinking yesterday or masking a hangover. He was really unusually cheerful and quite literally shouting (at 9am) in my garden. He dropped my son on the pavement within the first few minutes scratching his arm. He is normally a good father so u didn’t want to make a scene but now they have left I wonder if I should have said something? What would you do?