A nine-year-old boy who pinched his little brother on the testicles has had his apology published on Facebook.

In the letter, posted by the boys' mother, Zac tells his five-year-old brother that he's "so sad and sorry for pinching you in the nuts that I can feel the pain".

"I know that this note won't completely make it up for you so here's $1.00 all for you! I know it doesn't make the pain go away and I can't put a bandaid on it! You wouldn't be able to pee!," Zac writes. "I hope you feel better in the morning buddy!"

The incident occurred at Zac's family home in Adelaide.

The West Australian

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