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Kai, 11, was pictured alongside his dad and mum Coleen putting pen to paper on a contract at the Old Trafford club earlier this week.
Wayne played for United from 2004 until 2017 and is their all-time leading scorer with 253 goals from 559 appearances.
He wrote on Instagram: "Proud day. Kai signing for Man Utd. Keep up the hard work son."
Kai was also pictured holding up a United shirt with the No.10 on the back - the same number his dad wore.
Cristiano Ronaldo's son, Cristiano Junior, is also on the books of Juventus and there are plenty of other players looking to follow the example set by their dads by making their name in the sport.
Kasper Schmeichel, Daley Blind and Erling Braut Haaland are all established names in their own rights, but the following might be ones to keep an eye on...
Club: RB Leipzig (loan)
Father: Patrick Kluivert
Following in the footsteps of father Patrick, Justin Kluivert came through the famous academy at Ajax. He is currently on loan at RB Leipzig.
Define top bins...- Football Tweet (@Football__Tweet) October 9, 2019
Justin Kluivert: :dart::eyes:pic.twitter.com/XalbHw8Th1
Father: Didier Drogba
Isaac Drogba joined French side Guingamp in 2018 after leaving the Chelsea academy, 16 years after his father Didier signed for the club in an £80,000 move from Le Mans.
Club: Borussia Monchengladbach
Father: Lilian Thuram
Son of Lilian Thuram, Marcus is currently playing in the Bundesliga with Borussia Monchengladbach and has been capped three times for France.
Father: George Weah
Having grown up in the United States, Timothy Weah moved to France in 2014, playing for Paris Saint-Germain and Celtic prior to joining Lille in the summer of 2019.
Father: Gheorghe Hagi
Forward Ianis Hagi started his career at Romanian side FC Viitorul - managed and owned by father Gheorghe - before joining Genk in 2019. Now at Rangers.
Club: Spartak Moscow
Father: Henrick Larsson
Now playing in Russia with Spartak Moscow, striker Jordan Larsson started his career at Hogaborgs before enjoying success at Helsingborg under dad Henrik.
Jordan Larsson's goal for Spartak Moscow... pic.twitter.com/qKuI3uQgY8- Mark (@8teen88) August 26, 2019
Club: Juventus (loan)
Father: Enrico Chiesa
Son of Italian great Enrico, Federico Chiesa made 137 appearances for Fiorentina, joining Juventus on loan in the summer. Capped 21 times for Italy.
It's an absolute beauty from Federico Chiesa to put Juve ahead! :heart_eyes:- Premier Sports :tv: (@PremierSportsTV) December 16, 2020
Curled perfectly around the defenders and past the goalkeeper pic.twitter.com/cVcGWlE4la
Club: AC Milan
Father: Paolo Maldini
Continuing a long-running dynasty at the club, Daniel Maldini made his AC Milan debut in February, joining father Paolo and grandfather Cesare as the third of his name to play for the Rossoneri.
Daniel Maldini vs Monza (H / friendly)- ACM Comps (@CompsACM) September 6, 2020
First goal with Milan. :red_circle::black_circle:
Club: Borussia Dortmund
Father: Claudio Reyna
Born in Sunderland, Giovanni Reyna began his football journey at New York City, where his father Claudio served as sporting director. Giovanni joined Borussia Dortmund in 2019.
Club: LA Galaxy
Father: Jurgen Klinsmann
Jonathan Klinsmann turned professional contract with Hertha Berlin, joining Swiss side St Gallen in 2019. He moved to LA Galaxy in August.
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