Having a Christmas present spoiled is a downright horrible experience. It’s even worse when the surprise is ruined for a child. Of course, most kids have questionable impulse control, so there are many who no doubt spoiled their own gifts well in advance.
A person wondered if they were in the wrong for requesting that the gifs get locked up for Christmas after an incident last year. OP’s brother’s child went and opened everything up while the family was asleep, so it seemed like a good way to make sure history wouldn’t repeat itself. That is until the brother and his wife started to protest.