Mbappe is 15, and nine years younger than Kylian, and he came on in the friendly for Fabian Ruiz with PSG leading 1-0 at half-time.
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It gave Ethan a chance to show what he's made of as his side went on to secure a 2-1 win.
The younger Mbappe joined PSG in the same year Kylian moved to the capital club from Monaco.
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Ethan's move came from his local club AS Bondy and he signed a three-year contract with them in June 2021, making his debut for France's Under-21s in November that year.
After his debut, Ethan shared his excitement on Instagram: 'Very excited for my debut in the pros,' he said, as he hopes to make a mark on the senior team in the coming years.
Mbappe made his debut for the Under-19s against Juventus in September and later made his first UEFA Youth League involvement in the following month as PSG faced Maccabi Haifa.
He's going to be supporting his brother as Kylian plays in a second World Cup final on Sunday, hoping to win back-to-back World Cup titles with France as they take on Lionel Messi's Argentina in the showpiece football event of the year.
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Of course, Messi could become Ethan's teammate in the near future if he continues on this trajectory.
How far the younger Mbappe can go in the game remains to be seen but he's tied to PSG until the summer of 2024.
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