Alhred King of Northumbria was born to Oswulf King of Northumbria. Somewhat speculative based on the Anglo-Saxon Chronicle.
In 765 Æthelwald Moll King of Northumbria was deposed as King Northumbria. Alhred King of Northumbria was appointed King Northumbria.
Anglo-Saxon Chronicle. 767. This year Alred succeeded to the kingdom of the Northumbrians, and reigned eight winters.
Before 774 Alhred King of Northumbria and Osgifu of Northumbria were married. He the son of Oswulf King of Northumbria.
Anglo-Saxon Chronicle. 774. This year the Northumbrians banished their king, Alred, from York at Easter-tide; and chose Ethelred (age 12), the son of Mull, for their lord, who reigned four winters. This year also appeared in the heavens a red crucifix, after sunset; the Mercians and the men of Kent fought at Otford; and wonderful serpents were seen in the land of the South-Saxons.
In 774 Alhred King of Northumbria was deposed. Æthelred I of Northumbria (age 12) was appointed King Northumbria.
[his son] Osred King of Northumbria was born to Alhred King of Northumbria.
Paternal Family Tree: Bernicia
Great x 1 Grandfather: Eata Northumbria
GrandFather: Eadberht King of Northumbria
Father: Oswulf King of Northumbria