John P Ravilious gave the following summary. [1]
1.1 John de la Hay
Death: bef 31 Dec 1393[1]
of Spaldington, co. Yorks.'Johanne filio meo', executor of his father's will, together with his mother Cecilia and brother Thomas (will of Peter de la Hay, dated feast of St. Valentine, 1345 (proved 31 Oct 1347) [Test. Ebor. I:12-13[1]])
Will of John de la Hay, of Spaldington, dated 1391, proved 31 Dec 1393 [Test. Ebor. I:155-6[1]]
Children: Isabel
[1] Genealogy Medieval, [URL].