According to this Complete Peerage of England, Ireland & Scotland, Patrick was her brother not her father and Walter was her father.
Link here https://www.gengophers.com/book.html#/book/44627?page=955&given...
I can not find any outside sources confirming parentage. Where did you?
Kristen Murray
Kristen
Thanks for the heads up and ref. A preliminary look suggests that the current profile is supported by https://www.findagrave.com/memorial/90151726/sibilla-de_chaworth.
However, looking more closely at Sibyl's profile, it is clear there is a conflict with her birth date and the death of her father which I will investigate further.
Regards
Will