What kind of mom would pull a prank of this nature on an expecting mother like this, in front of everyone, during what is supposed to be a very special day?
This mother is not happy with a young woman who she thought would be the mother of her son's child.
I can only imagine the frustration from someone who not only thought she was about to be getting a new grandchild but came to realize that someone so close to her family could possibly deceive them in such a manner...