When Sarah Bromby handed her 5-year-old son a card, he had no clue what was in store.
"Guess what, you're going to be a big brother!" she tells him.
And then all sorts of hilarity, adorableness, and downright excitement ensues.
"Is it in your belly?! Is it?"
"I'm going to be a new big brother!"
Then he reminds his mother that this is not to be taken lightly...
"I hope you're not joking."
"He can sleep in my bed, if he wants," he adds kindly.
The video starring this British, soon-to-be brother goes on for nearly three minutes, and it's worth every single second.
Watch the full video below: