Kind(eren):
Nobody on SGM has an ancestry for Walchelin/Walkelin, but they do statethat he was probably connected to the Ferrers. Burke's Commoners has himas son of Henry, which seems reasonable.
Note: I don't know for sure if the 1086 was Walchelin's birth year, or anindicator that he held Radbourne in Domesday. Rosie Bevan certainlydisplayed the date as if it was his birth year.
no ancestry given