In this hysterical video, which has had over 10 million views on YouTube, we hear the mum announce proudly telling her son that she is pregnant again.
But we're sure his reaction wasn't quite what she was expecting, as he throws his head into his hands and demands: "What were you thinking?" Uh oh!
And as the news sinks in, he seems to get even more annoyed about the family's new addition: "This is exasperating! This makes no sense."
Even his mum's insistence that he or his sister won't be replaced doesn't seem to pacify him.
At least he has nine months to come round to the idea!
Reveal is now on Google Plus! Join us here for the latest pictures, fashion and celebrity news!