He married Mabel de Beaumont, a daughter of
Robert de Beaumont, Count of Meulan by his wife Maud FitzRoy, a daughter and co-heiress of
Reginald de Dunstanville, 1st Earl of Cornwall by his wife Beatrice FitzRichard. By Mabel de Beaumont he had one son who predeceased him and two daughters: • Baldwin de Redvers (b. after 28 April 1200; d. 1 September 1216), eldest son and
heir apparent, who predeceased his father aged under 16, having married Margaret FitzGerold, daughter and heiress of Warin FitzGerold (1167 – post-1216) (eldest son and heir of Henry FitzGerold (d.1174/5), Chamberlain to King
Henry II) by his wife Alice de Curcy, sister and heiress of William de Curcy IV (d.1194)
feudal baron of
Stoke Curcy (now
Stogursey) in Somerset and of
Harewood in Yorkshire. He left a son
Baldwin de Redvers, 6th Earl of Devon. • Mary de Redvers, known as "Mary de Vernon", who married, firstly,
Pierre des Preaux (Anglicised to "Peter Prouz" and
Latinised as
de Pratellis ("from the meadow")).
Ralph Brooke (1553–1625),
York Herald, and others, stated that her descendants by her first marriage were the "Prouse" family of
Gidleigh Castle (built by
William Prouz and of
Chagford in Devon; the arms of de Redvers were quartered by this family, as is visible on the monument of Humphrey Prouse (d.1648) in Chagford Church. However, the Devonshire historian Sir
William Pole (d.1635) was sceptical about Brooke's version of the pedigree which he could "hardly admytt without better proofe than theire allegacion", objecting that he had never encountered the Devonshire Prouses called
de Pratellis in any documents, and that their name was instead Latinised as
Probus ("upright, proud"). Mary de Redvers married, secondly, Robert de Courtenay (died 1242),
feudal baron of Okehampton, Devon, son of
Reginald II de Courtenay (died 1194) by his wife Hawise de Curcy (died 1219), heiress of Okehampton. From this marriage, the Courtenays later inherited the feudal barony of Plympton in 1293 and in 1335 were declared
Earls of Devon. Robert de Courtenay (died 1242) was the great-grandfather of
Hugh de Courtenay, 1st/9th Earl of Devon (d.1340). • Joan de Redvers, who married William Brewere; she had been betrothed to
Hubert de Burgh, 1st Earl of Kent, but the marriage did not proceed. ==Death and succession==