The biography of Sir Richard Willoughby (c1290-1362) is in the Nottingham University collection
https://www.nottingham.ac.uk/manuscriptsandspecialcollections/colle...
In the second sentence of the second paragraph it states that he (and not his father) married the daughter of Roger Monteyn, i.e. Isabel Monteyn.
It goes on to state that he married twice more, secondly to Joan de Charron and thirdly to Elizabeth Champernowne.
This is completely different to his profile on Geni and is more credible, since if we accept that Isabel was born c1290 she cannot possibly be his mother.
