A video uploaded to YouTube earlier this week shows a young girl, aged at around 3-years-old, crying after apparently finding out thather baby brother - only months old - is going to grow up.
"What! I don't want her to grow up," the young girl, reportedly named Sadie, cries to the camera.
She looks at her brother with tearful sad eyes several times, and hugs him.
The baby boy looks at her and smiles.