Cristiano Ronaldo has a four-year-old son and no one knows who the mother is. Not even the baby! But with her new biography, Cristiano Ronaldo’s mother, Dolores Aveiro, revealed a few new clues about who the baby mama may be. Elma, his sister, also spoke up about her nephew’s mysterious birth mother as well.

Cristiano Ronaldo, the famous Portuguese striker, shocked everyone when he announced that he now has a baby in 2010. The announcement also included the fact that there is no mother and that he had the exclusive rights to the child.

Many have conjectured that the mother was just a surrogate, but then the question was, why would then 25-year-old Cristiano Ronaldo want to have a surrogate baby?

Dolores Aveiro launched her official biography this month in Portugal, which included new details about Cristiano Ronaldo’s baby son, Cristiano Jr. In her biographer, she says that she picked the baby up from Florida when he was born because Cristiano was playing in the South Africa World Cup games.

According to the Sunday Mirror article dated 2010, it states that the mother was an American waitress with whom Cristiano had a one-night stand. It is also rumored that he paid her £20 million for paternity fees.

Whoever the mother is, she has no custody of the child.

With the biography release, Cristiano’s sister Elma spoke up about how the Aveiro family has been keeping the secret from the child.

She told the Mirror, “Once we told him she was in Heaven, but my brother and mum asked us not to repeat it.

“We say now his mum went traveling. He goes silent, forgets about it and doesn't ask any more.”

Elma added, “If later on Cristianinho wants to know who his biological mum is, it will be his decision and no one’s going to stop it.”

This all sounds like they still don’t have a clear story to tell baby Cristiano, affectionately called Cristianinho.

Cristianinho often shows up in his father’s Instagram.

The Portuguese striker captioned this picture, “Happy to spend Children's Day with my son”.

He lives with Ronaldo and his grandmother Dolores in Spain. Cristiano Ronaldo has been linked with Irina Shayk since 2010.