Uther Pendragon probably wasn't a historical man, if he was, then we would have to see if he had any issue. Arthur Pendragon can't be found in any doucment, though Pendragon was a title, it is unlikely a man named Arthur held it. But then, nothing is certain in the realm of history.
Yes he was their son.
Arthur, who became King Arthur
King Arthur was the son of Uther Pendragon and Igraine.
According to the legend, Arthur was the son of King Uther Pendragon and proved this by pulling the sword from the stone when no one else could do it.
Uther Pendragon, the King of England, was deeply in love with Igraine of Cornwall. Uther's assistant, Merlin, a magician, promised that they would be married if Uther gave Merlin a son. So, Uther and Igraine fell in love and had Arthur who was sent to live with Sir Ector for safety and because Uther was going to die.
He was the illegitimate son of Igraine of Cornwall - a nobleman's wife - and King Uther Pendragon, but he was raised by a manor lord.
Arthur, who became King Arthur
King Arthur was the son of Uther Pendragon and Igraine.
Arthur was the son of Uther and Ygraine - but Ygraine was NOT Uther's wife when Arthur was conceived. Had Uther and Ygraine had other legitimately conceived children, Aurthr would have been .... "inconvenient", and a potential threat to Uther's other sons. For Arthur's own safety, Merlin took the infant Arthur away to be raised separately. One more point; there is only ONE KING AT A TIME. If Uther was King, then Arthur could not be - and Arthur could not be King while Uther lived.
He was a heir to the throne and Uther Pendragon's son
The king after Uther was King Arthur, I think
King Uther Pendragon is the father of King Arthur.
King Arthur's father is King Uther Pendragon.King Arthur's biological father was Uther Pendragon. His adoptive or foster father was Sir Ector.
According to the legend, Arthur was the son of King Uther Pendragon and proved this by pulling the sword from the stone when no one else could do it.
In Arthurian legend, Arthur is the illegitimate son of Uther and Ygraine. Ygraine was the husband of a client king of Uther, but Uther fell in love with her, killed her husband in battle and took her as his own bride.
Uther Pendragon, the King of England, was deeply in love with Igraine of Cornwall. Uther's assistant, Merlin, a magician, promised that they would be married if Uther gave Merlin a son. So, Uther and Igraine fell in love and had Arthur who was sent to live with Sir Ector for safety and because Uther was going to die.
King Uther.
He was the illegitimate son of Igraine of Cornwall - a nobleman's wife - and King Uther Pendragon, but he was raised by a manor lord.