Bishop John de Harewell - Parentage Not Known to Date

I searched both for parentage and found no legitimate source(s) proving parentage for Bishop John.
Extant sources do prove the existence of John Atte Halle, but none of those names a spouse or children.

Is there any legitimate source that prove' this John as the father of Bishop John de Harewell?
While I see the hyperlinks parental profiles are not master profiles, I question the merit
of including anything from David Nash's website that's non-sourced.