About Thorkell Leifsson
Thorkell Leifsson was born circa 1000, presumably in Greenland. When his father Leif died, circa 1020, Thorkell became the chieftain of Eiríksfjǫrðr.
Leif Eriksson traveled from Greenland to Norway in 999, at was about this time that his son Thorgils is born. The sagas do not specifically mention the circumstances of Thorkell's birth nor who his mother was but the implication is that he did not share the same mother as Throkell.
Leif Eriksson (c. 970 Iceland - c. 1020 Greenland) and mother unknown.