I think it was a good suggestion by Will Johnson to check sources. It paid off for me as I have now disconnected one obviously wrong link.
Faris in his Plantagenet Ancestry, 1st edition, mentions that Sir Roger Kynaston and Lady Elizabeth Grey had two sons and six daughters.
So far I have found only one son and three daughters. The son is Humphrey, the daughters Jane, Mary and Emma.
Sadly Landed Gentry only mentions Humphrey.
Combining with Weis, Ancestral Roots, 7th edition, I have
Sir Roger Kynaston, born circa 1430, died 1517.married in 1465 Lady Elizabeth Grey, born 1440 and died ater 1501.
I have only a guess at the birth of Jane, ca.1470. She married Roger Thornes, of Shelrock.
For her I have as a descendant Gateway Ancestor Nathaniel Littleton.
Mary married Hywel ap Jenkin
Her Gateway Ancestor descendants I have as Jane Vaughan, Rowland Ellis and Margaret Roberts
Emma I have found only in William Addams Reitwiesner's book,
for her I have many titled Brits as descendants, but also Dame Edith Sitwell, Primula Susan Rollo wife of David Niven, and Annemarie Gualthérie van Weezel wife of Carlos duke of Parma.
I had a daughter Margaret but double checking (because her dates made it impossible) I have now given the father shown in BP 1999.
Any addition or correction gratefully accepted.
Leo van de Pas
Canberra, Australia