‘Instantly aged 50 years’: Chinese boy, 12, has tearful meltdown while frustrated from teaching younger sister maths, amuses millions
- A video of a boy losing his cool as he tries to teach his younger sister maths has gone viral on mainland social media
- The video clip showing the boy in tears soon became a trending topic online, with 8 million views on Douyin alone

A crying 12-year-old boy in China frustrated by his nine-year-old sister’s stubbornness while showing her how to solve a maths problem has trended on mainland social media.
A video of the moment was filmed and posted online by the children’s mother, surnamed Zhong, earlier this week.
The mother, from Liaoning province in northeastern China, said her son took the initiative in teaching his younger sister maths after seeing her become angry with the girl while trying to do the same earlier.

Zhong said at first the brother was gentle with his sister and the two children interacted well initially, but soon they argued about how to solve a maths problem.
The boy, who thought he was supposed to be teaching in the scenario and confident in his maths ability, was furious that his sister did not follow his instructions.
“You are also not qualified as a teacher,” his mother said jokingly to him in the video.
“I told her directly the answer that there are three right angles in this picture, but she still insisted that there are two right angles,” the boy said, becoming hysterical and holding on to a nearby chair for support as his legs seemed to buckle and his body started to sway.