My grandchildren spend alternate Christmases with their two sets of grandparents. This year they are with the other ones, so I get to decorate the tree with glass baubles going back to when I was born.
It's far better to use unbreakable baubles when the children are here than have to keep telling them to be careful in case they break the glass ones. It won't be long before they're old enough to understand how easily these break.