It's hilarious when kids have stunned, excited reactions when opening up gifts on Christmas morning. But, when Grandpa has even a better reaction than them because he's so happy, it may be just a little bit better.

Check out this video of Grandpa-to-be finding out that he's going to be getting a grandchild. A man and his wife and surprised his family with t shirts on Christmas day telling them that they are going to have a baby! The t-shirts read "best grandpa ever", "my grandma is the coolest" and "I love my aunt Kait"! The reactions are great.