Sources

1) Source: Chancery: Inquisitions Post Mortem, Series I, Edward III "Nicholas de Meynyl or de Menyll: Northumberland, Yorkshire... Elizabeth, daughter of the said Nicholas and Alesia, aged . . at the feast of St. Michael last, is his next heir." Dated: 20 November 1341. External Link
https://www.british-history.ac.uk/inquis-post-mortem/vol8/pp223-239. Reference: C 135/65/24 (Data from direct source)
2) Source: Chancery: Inquisitions Post Mortem, Series I, Edward III "John Darcy of Knayth (Knaith) or John Darcy, knight...Inq. taken at Ekynton, Saturday after St. Edward the King, 30 Edward III...He died at Notton on Saturday after St. Cedde last. John his son, aged 5 years at the Nativity of St. John the Baptist last, is his heir...to him and Elizabeth his wife"Dated: 1356 Elizabeth, his wife, was father of John Darcy's children.. External Link
https://www.british-history.ac.uk/inquis-post-mortem/vol10/pp245-259. Reference: C 135/133/31 (Data from secondary evidence)
3) Source: Chancery: Inquisitions Post Mortem, Series I, Henry IV "John Darcy, knight... Elizabeth, his father’s widow...John Darcy his grandfather and Elizabeth his wife...After the deaths of John and Elizabeth they descended to Philip their son, and so to John his son...that they should enfeoff Philip son of John and Eleanor, Philip’s wife, daughter of Henry Lord Fitzhugh...He died on 9 Dec. last. Philip his son and heir is aged 14 years and more...Jointly with Margaret his wife, by the grant of Philip Lord Darcy and Meinill to them and the heirs male of their bodies, he held the manor of Sturton le Steeple of Joan Lady Beauchamp by knight service, annual value £8"Dated: 1411. External Link
https://www.british-history.ac.uk/inquis-post-mortem/vol19/pp339-362. Reference: C 137/87/36 (Data from direct source)