Video shows young girl learning her baby brother will grow up...

Mike Krumboltz
The Sideshow

We're not evil. We don't delight in watching children cry their eyes out. And yet, in this case, we're going to have to make an exception.

In a video that is sure to go viral, Sadie, 5, is informed that her baby brother won't be a roly-poly bundle of giggles forever. He's going to grow up.

This was apparently the first Sadie had heard about it. Through a fountain of tears, Sadie declares that she doesn't want her brother to grow up. No, sir!

"He's so cute," Sadie sobs, while giving her brother little kisses on his forehead. "Oh, you are so cute, I love your cute little smiles."

"Oh, my gosh, I want him to stay little," she continues.

As if on cue, the brother -- who, we admit, makes most puppies look like gargoyles -- gives his big sis a heart-melting smile.

Sadie, we feel your pain.

Follow Mike Krumboltz on Twitter (@mikekrumboltz).