Sources

1) Source: Chancery: Inquisitions Post Mortem, Series I, Henry VI "Aylesbury, Katharine de, who was the wife of the late Thomas, kt: Northants, Bucks""She died on 17 July last. Lawrence Cheyne , her son and next heir, is aged 40 years and more.""Isabel, wife of Thomas Chaworth, knight , and Eleanor, wife of Humphrey Stafford of Grafton Manor, knight , daughters and next heirs of Thomas de Aylesbury , are both aged 30 years and more.""Walter was seised of this rent in demesne as of fee and he died thus seised. After his death, the rent descended successively to Philip de Aylesbury , as his son and heir, Thomas de Aylesbury , as son and heir of Philip, and John de Aylesbury , as son and heir of Thomas. They all likewise died seised in demesne as of fee. After the death of John, Thomas de Aylesbury , son and heir of John, was likewise seised in demesne as of fee"Dated: 26 July 1436. External Link
http://discovery.nationalarchives.gov.uk/details/r/C6159539. Reference: C 139/82/50. King's College London, 2014. | Mapping the Medieval Countryside [online]. Available at http://www.inquisitionspostmortem.ac.uk/view/inquisition/24-671/673 (Data from secondary evidence)
2) Source: Chancery: Inquisitions Post Mortem, Series I, Edward III "Philip de Aylesbury...ohn Thurbern, chaplain, who granted it to the said Philip and Margaret for their lives by fine in the king’s court, with remainder to Thomas their son and his heirs. The said Thomas died in the lifetime of Philip and so, after the said Philip’s death, the manor should remain to John son of the said Thomas and his heirs. ...He died on 14 July last. John son of the aforesaid Thomas, aged 13 years and more..."Dated: 1349. External Link
https://www.british-history.ac.uk/inquis-post-mortem/vol9/pp328-367. Reference: C 135/106/2 (Data from direct source)
3) Source: The History of Parliament . External Link
http://www.historyofparliamentonline.org/volume/1386-1421/member/aylesbury-sir-john-1334-1409. Reference: Aylesbury, Sir John (1334-1409), of Milton Keynes, Bucks. (Questionable reliability of evidence)
4) Source: Chancery: Inquisitions Post Mortem, Series I, Edward III "John de Aylesbury, kinsman and heir of Philip de Aylesbury...John was 21 years of age on the feast of St. John ante portam Latinam last, and that he was born in the town of Weldon Basset on the said feast, 8 Edward III, and was baptised in the church there... it was said then that Thomas de Aylesbury, father of the said heir, had a son."Dated: 1335. External Link
https://www.british-history.ac.uk/inquis-post-mortem/vol10/pp228-245. Reference: C 135/132/4 (Data from direct source)