There must be something in the water in the Mbappe house.
While World Cup winner Kylian is already one of the greatest players of his generation and in with a chance of becoming one of the greatest of all time, younger brother Ethan is also making a name for himself in youth football.
The 14-year-old has signed a new youth contract with PSG that will run until 2024, and if all goes to plan he could be on the fringes of the first-team and be ready to turn pro when it is up for renewal.
Thanks to being publicly known so young, Ethan has automatically joined a group of youth players, along with Borussia Dortmund's Youssoufa Moukoko, that fans are keeping a firm eye on before they break into senior football in the next few years.
Here's a bitesize rundown of what you need to know about Mbappe jnr.
He has more than one older brother footballer
As well as Kylian, Ethan has another older brother footballer in the shape of Jires Kembo Ekoko, a Zaire-born former France Under-21 international who was adopted by the family as a child.
Kembo Ekoko spent time at the famed French football academy at Clairefontaine, before making his senior breakthrough at Rennes. The striker made over 100 Ligue 1 appearances and went on to play for clubs in UAE and Qatar, before finishing his career with a spell at Bursaspor in 2019.
He was born in December 2006
Enough to make you feel extremely old? Read it again, Ethan was born in 2006, at the end of the year, no less, and won't turn 15 until December 2021.
He was born after the 2006 World Cup and after Cristiano Ronaldo and Lionel Messi were already beginning to establish themselves as the best in the world.
He joined PSG at Under-12 level
Having been present at his brother's official PSG unveiling in 2017, Ethan joined the club's famous youth ranks the following year at the age of 12. But his place at France's biggest club is far more than just a token gesture to keep the family happy.
The French capital is a celebrated hotbed of young talent, regularly producing world class stars, while PSG's academy is a famed production line that has seen players Kingsley Coman, Presnel Kimpembe, Adrien Rabiot, Christopher Nkunku and Xavi Simons emerge in recent years.
While Kylian's presence at the club may well have influenced PSG to take a close look at Ethan, the teenager is undoubtedly keeping his place on merit after landing his new deal.
He scored on his PSG debut
If there was ever any doubt about Ethan when he was brand new at PSG, he silenced any critics by scoring on his debut for the Under-12 team the 2018 edition of the prestigious Mediterranean International Cup in a 9-0 win over Japan's Ys Gem Academy.
He has followed in the footsteps of Lionel Messi
Comparisons with his own brother are inevitable, but Ethan was walking on youth football's hallowed ground when he was at the Mediterranean International Cup in 2018.
He inspired Kylian's famous goal celebration
The early years of Kylian's career have featured an instantly recognisable arms folded goal celebration, which is believed to have been originally inspired by Ethan from their days playing together on the PlayStation at home.