Sources

1) Source: The History of Parliament Evidences that John is father of Ralph.. External Link
http://www.historyofparliamentonline.org/volume/1386-1421/member/stafford-ralph-1410. Reference: Stafford, Ralph (d.1410), of Grafton, Worcs. (Questionable reliability of evidence)
2) Source: Varied - Secondary Source for Medieval Genealogy Details on the Draycote family from a variety of secondary sources.. External Link
https://groups.google.com/g/soc.genealogy.medieval/c/lHIFzCQs7co/m/GSxJj0x5cFoJ. Reference: Post by John P Ravilious dated 20 May 2004 to soc.genealogy.medieval (Questionable reliability of evidence)
3) Source: The History of Parliament . External Link
http://www.historyofparliamentonline.org/volume/1386-1421/member/stafford-ralph-1410. Reference: Stafford, Ralph (d.1410), of Grafton, Worcs. (Questionable reliability of evidence)
4) Source: The History of Parliament . External Link
http://www.historyofparliamentonline.org/volume/1386-1421/member/burdet-sir-john-14023. Reference: Burdet, Sir John (d.1402/3), of Huncote, Leics. (Questionable reliability of evidence)
5) Source: The History of Parliament . External Link
http://www.historyofparliamentonline.org/volume/1386-1421/member/stafford-humphrey-1384-1419. Reference: Stafford, Humphrey (c.1384-1419), of Grafton, Worcs. (Questionable reliability of evidence)
6) Source: Chancery: Inquisitions Post Mortem, Series I, Henry IV "Ralph Stafford...In right of Maud his late wife he held the manor of Grafton Manor for life by the courtesy of England...He died on 1 March last. Humphrey his son and heir is aged 26 years and more....He held a rent of £10 from the manor of Whatcote by the grant of Hugh de Stafford, earl of Stafford, with reversion to Hugh and his heirs, of whom and by what service is unknown. He died on 2 March 1410. "Dated: 1410. External Link
https://www.british-history.ac.uk/inquis-post-mortem/vol19/pp251-269. Reference: C 137/79/38 (Data from direct source)