Even Laenor, Rhaenyra's husband, hints that he knows the princes are not biologically his children in Episode 6. Despite the seeming acceptance of the children's true parents, whispers in the Red Keep intensify following Harwin's fight with Criston, the latter of whom teased the former about his secret fatherhood.
Rhaenyra and Daemon both know Laenor is alive, and faked his death.
During the civil war called the Dance of the Dragons (129 AC - 131 AC), Laenor's three sons by Rhaenyra all died.
Jacaerys, Rhaenyra's eldest son, and his two younger brothers have spent their short lives surrounded by whispers that their real father was Ser Harwin Strong. It's an open secret that these “strong” boys aren't the sons of Laenor Velaryon.
It is quickly confirmed that Alicent is right, however. Rhaenyra's sons are bastards. They're the illegitimate children of Rhaenyra and Ser Harwin Strong (Ryan Corr). The issue of the children's legitimacy is an open secret at court, with people turning a blind eye because the king does.
The episode doesn't really beat around the bush when revealing that Harwin Strong (Ryan Corr) is the father of Rhaenyra's children. He's there soon after baby Joffrey is born so he can meet him, and later on in the episode Jacaerys (Leo Hart) even asks his mom if Harwin is his real dad.
In a poetic end to the deadly war, Rhaenyra's son with Daemon became King Aegon III. He was also wed to his cousin, Aegon II's daughter Jaehaera.
Rhaenyra's three eldest sons all died fighting during the Dance of the Dragons, but her two youngest sons, the sons by her second husband, Prince Daemon, survived the civil war.
It isn't explicitly stated in the show, but because we learn after episode six that all three boys have dark brown hair — and despite Rhaenyra and Laenor's matching blond color — it has been strongly implied that they are actually the children of Ser Harwin Strong, the Lord Commander of the City Watch.
Daemon and Rhaenyra share two children together: Aegon III and Viserys II.
Rhaenyra was perfectly capable of having kids, and she had five healthy sons. Laenor didn't have children because he didn't want to, not because he was incapable (as in he was impotent, sterile, or had a condition that lowered his ability to sire children, such as undescended testicles, hypospadias, or chordee.)
Ser Laenor and Princess Rhaenyra had three sons, Jacaerys Velaryon, Lucerys Velaryon and Joffrey Velaryon. Although due to the traits of these three, and Laenor spending very little time with Princess Rhaenyra, it was clear that Jacaerys, Lucerys, and Joffrey were not his children.
Rhaenyra has had a tough couple weeks. First, she finds out that her half-brother Aegon II has usurped the throne and that she will have to fight for her claim as queen. Then, she gives birth to a stillborn child. And finally she loses her second eldest son Lucerys to a dragon battle.
In House of the Dragon's season 1 finale, Rhaenyra learns about the tragic death of her beloved son Lucerys Velaryon, after having sent the young boy to deliver a message to Lord Borros Baratheon.
Prosthetic designer confirms: the baby was deformed
The dead girl had been named Visenya. “ The baby was clearly among those rare cases in the Targaryen line, where it was described that an unsuccessful birth had produced a stillborn baby with dragon-like features.
With both Rhaenyra and Aegon gone, there's one clear person to inherit the throne: Rhaenyra's son Aegon, known as “Aegon the younger” in the books (her older sons had all died by this point).
Even Laenor, Rhaenyra's husband, hints that he knows the princes are not biologically his children in Episode 6. Despite the seeming acceptance of the children's true parents, whispers in the Red Keep intensify following Harwin's fight with Criston, the latter of whom teased the former about his secret fatherhood.
Two of the most powerful folks in Westeros are Queen Alicent and Princess Rhaenyra. The former had three children with King Viserys, and the latter also gave birth to three sons during her marriage with Laenor Velaryon.
They casted them younger for a reason. Aegon and Aemond actors are in their twenties while Jace and Luke actors are in their teens. Besides the obvious age difference, Aegon and Aemond are clearly being trained to fight by Criston.
When finally did give birth to the baby, it is said that the child had a hole where her heart should have been, a tail, and scales for skin—a monster, as her mother had cursed her to be.
According to the accounts of Septon Eustace, prior to her turning sixteen, Rhaenyra lost her virginity to her uncle, Prince Daemon, after he seduced her.
Then, following a time jump in episode 3, he mentions she is now 17 (and “of age” to marry). This marks a significant change from the book, which states that Rhaenyra was born in 97 AC, and would be only 9 years old when her father marries Alicent. Milly Alcock, who plays young Rhaenyra, is 22.
King Aerys II Targaryen ("The Mad King")
The final undisputed monarch of the Seven Kingdoms from House Targaryen, King Aerys II Targaryen is widely known as the "Mad King" who was usurped by King Robert I Baratheon. Aerys II is a direct descendant of King Viserys I Targaryen through his daughter Rhaenyra.
1 Daemon Probably Loves Rhaenyra
However, Fire & Blood gives some insights into Daemon's character, which House of the Dragon only touches on in the last episodes of Season 1. Daemon shows his genuine care and attention to Rhaenyra several times before the two marry.
Eventually, it's Daemon and Rhaenyra's two sons who end up sitting on the Iron Throne, but is that for a future series? The Velaryons survive, but in recent years Ser Corlys has come to support the Greens, after falling out with Rhaenyra and being accused of treason (unfairly).