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Male Duncan Click to view Duncan in the family tree

Duncan was born about 1013 in Of, Atholl, Perthshire, Scotland.1   Duncan's father was Crinan De Mormaer and his mother was Bethoc (Beatrix) Princess Scotland.  His paternal grandparents were Lord OfMORMAER Duncan and Mrs-Duncan Mormaer; his maternal grandfather was Malcolm. He had a brother and a sister, named Maldred and Daughter Princess Of.  He was the second oldest of the three children.  He died on August 14th, 1040 in Iona, near Elgin, Scotland (killed.1 

Family Details of Duncan's family with Sibyl Fitzsiward

1 phelps1609.FTW
Further sources/citations:
World Family Tree Vol. 16, Ed. 1 @ Tree #1609, World Family Tree Vol. 2, Ed. 1 @ Tree #2013, 2013.ftw