Sources

1) Source: Chancery: Inquisitions Post Mortem, Series I, Henry IV "BALDWIN DE FREVILL, knight... He died on 4 Oct. Baldwin his son and heir was aged 5 years on Midsummer day... granted them to Baldwin Frevill and Joan his wife and the heirs of their bodies, with remainder to Joyce, widow of Baldwin, father of Baldwin Frevill, and the right heirs of the younger Baldwin. Joan died without heirs and Baldwin married Maud and had issue Baldwin. The elder Baldwin is dead and the manors should to to Adam de Peshale, knight, and Joyce, now his wife." Dated: 1401. External Link
https://www.british-history.ac.uk/inquis-post-mortem/vol18/pp125-144. Reference: C 137/29/77 (Data from direct source)
2) Source: Chancery: Inquisitions Post Mortem, Series I, Richard II "Baldwin Fryvell, knight... He died on Monday after St. Thomas the Martyr, 11 Richard II. Baldwin his son, aged 19 years and more, is his heir... He held the under-mentioned castle in fee tail, to him and the heirs of his body, by a fine levied by Baldwin de Wytheneye, in the king’s court and with the king’s licence, to a certain Bladwin Frevyll and Ida his wife and the heirs of their bodies, with remainder to the right heirs of the said Baldwin Frevyll. The Baldwin mentioned in the writ was son and heir of the last-named Baldwin and Ida." Dated: 1388. External Link
https://www.british-history.ac.uk/inquis-post-mortem/vol16/pp218-241. Reference: C 136/52/1 (Data from direct source)
3) Source: A topographical and historical description of the parish of Tixall Genealogical notices concerning the intermarriages of the Aston family. Reference: Appendix V (Questionable reliability of evidence)
4) Source: The History of Parliament . External Link
http://www.historyofparliamentonline.org/volume/1386-1421/member/aston-sir-thomas-141213. Reference: Aston, Sir Thomas (d.1412/13), of Haywood, Staffs. (Questionable reliability of evidence)
5) Source: Gregory of Stichivall "An agreement made between Thomas Ferrers and Elizabeth his wife, Sir Roger Aston', knight, as guardian of Robert son and heir of Joyce [Aston] and Hugh Wylloughby and Margaret, his wife (the said Elizabeth, Joyce and Margaret being sisters and co-heirs of Sir Baldwin Frevill', knight), concerning the division of the manors and lands of the said Baldwin during the minority of the said Robert." Dated: 19 August 1423. External Link
https://discovery.nationalarchives.gov.uk/details/r/16dee81f-459b-4c49-97ed-26d90fac90da. Reference: DR10/1316 (Data from direct source)