Maud Bowes (FitzHugh) - Son Born Well after Father's Death?

Very different here.

https://our-royal-titled-noble-and-commoner-ancestors.com/p1160.htm... Citing Douglas Richardson

Sir Ralph Bowes, Sheriff of Durham was born circa 1450 at of Streatlam & Dalden, Durham, England.2,3,4

He married Margery Conyers, daughter of Sir Richard Conyers and Alice Wycliffe, circa 1475;

They had 4 sons (John; Sir Ralph; Sir Robert; & Richard) and 1 daughter (Margery).2,3,4

Sir Ralph Bowes, Sheriff of Durham left a will on 6 July 1482; Buried in Eggleston Abbey, Durham.2,3,4 He died between 6 July 1482 and 31 December 1482.