Cristiano Ronaldo’s son, Cristiano Jr, seems to have inherited his father’s athletic ability, as showcased in a post shared by the renowned footballer in late February.

Cristiano Ronaldo with his son Cristiano Ronaldo Jr in the gym. Photo: @cristiano/Instagram

The former Real Madrid and Manchester United star – who was rocking blue nail polish on his toes in the snap – was pictured with his son after a morning workout session in what appears to be his home gym in Saudi, according to British media.

Cristiano Ronaldo Jr’s mum’s identity remains a mystery. Photo: @ronaldooo.jr7_/Instagram

Here’s what we know about Cristiano Ronaldo’s 13-year-old mini-me son:

Cristiano Ronaldo Jr is the son of the legendary football star – but his mother’s identity is a mystery

Cristiano Ronaldo Jr is already playing high level football like his father. Photo: @ronaldooo.jr7_/Instagram

Cristiano Jr – full name Cristiano Ronaldo dos Santos Júnior – was born on June 17, 2010, and is the football star’s first child. And while we know that Cristiano is his father, his biological mother’s identity has never been revealed, per People magazine.

Cristiano Ronaldo Jr was born in 2010. Photo: @ronaldooo.jr7_/Instagram

Ronaldo Sr told Jonathan Ross in 2015, “Some points in life are private and people have to respect the privacy. When Cristiano is going to grow up, I am always going to say the truth to him because he deserves it, because he is my son. But I am not going to say [it just] because people want me to say.”

Cristiano Ronaldo Jr lives with his father and Cristiano Ronaldo Jr in Saudi Arabia. Photo: @ronaldooo.jr7_/Instagram

In a statement, Ronaldo tweeted at the time, “It is with great joy and emotion that I inform I have recently become father to a baby boy. As agreed with the baby’s mother, who prefers to have her identity kept confidential, my son will be under my exclusive guardianship. I request everyone to fully respect my right to privacy (and that of the child) at least on issues as personal as these are.”