Sources

1) Source: Chancery: Inquisitions Post Mortem, Series I, Edward II "John Botetourt...All held as of the inheritance of Maud his wife...John, son of Thomas son of the aforesaid John, aged 7, is his next heir...He died on 25 November last."Dated: 1324 Thomas's son inherited from Thomas's father, John.. External Link
https://www.british-history.ac.uk/inquis-post-mortem/vol6/pp361-373. Reference: C 134/89/16 (Data from secondary evidence)
2) Source: Chancery: Inquisitions Post Mortem, Series I, Edward II "Thomas Boteturt, Butetourte alias de Botetourte...John his first-born son, aged 4, is his next heir." Dated: 1321. External Link
https://www.british-history.ac.uk/inquis-post-mortem/vol6/pp242-252. Reference: C 134/76/1 (Data from direct source)
3) Source: Chancery: Inquisitions Post Mortem, Series I, Edward III "Joan, late the wife of Thomas Botetourt...John Botetourt her son, aged 19 years and more, is her next heir."Dated: 1338. External Link
https://www.british-history.ac.uk/inquis-post-mortem/vol8/pp107-117. Reference: C 135/54/9
4) Source: Chancery: Inquisitions Post Mortem, Series I, Edward III "Reynold Grey of Wilton on Wee (Wye)...He died on Tuesday in Whit week last. Henry de Grey, his son, aged 30 years and more, is his heir...Morton. A messuage and 40a. land, (fn. 7) held in fee tail jointly with Maud his wife, who survives, by grant of Henry de Grey, his father...He died on 4 June...He died on 28 May last"Dated: 1370. External Link
https://www.british-history.ac.uk/inquis-post-mortem/vol13/pp17-31. Reference: C 135/216/11 (Data from secondary evidence)