Verified answer

No, they were not related by blood.

In 1013, Cnut's father, Sweyn, King of Denmark and parts of Norway, became King of England by right of conquest. He died the following year and the former English King Æthelred, who had been exiled, was restored to the throne. Cnut fled England but was able to launch another invasion. When Æthelred died in 1016, his son Edmund Ironside succeeded him. After the Battle of Assandun Cnut and Edmund agreed to divide England between them, but Edmund died shortly afterwards, leaving Cnut as undisputed king.

Eadwig Ætheling, Edmund Ironside's brother, returned from exile in 1017, but was murdered by Cnut who wanted to rid himself of his rival.

Cnut ruled England for almost twenty years.

Cnut was a descendant of Harold Bluetooth , king of Denmark ( 910 86/7 ). Cnut married Emma the widow of Aethelred II ,c 985 /7- 1052 . . Eadwig was the brother of Edmund ( Ironside ). Aethelred is descended from Alfred the Great , .

After several battles, Edmund and Cnut agreed to share power . Edmund took Wessex and Cnut ruled all the land to the north pf the Thames . When Edmund died in November 1016 , Cnut seized Wessex and had Edmund's brother Eadwig killed in order to consolidate his position .

Cnut was a Viking warlord who conquered England by force, just like William the Conquerer.