see Ancestral Roots, line 210, 249

Roger’s line is also given in the Wikipedia article “Dudley Castle.”

See Foundation for Medieval Geneaology; http://fmg.ac/Projects/MedLands/ENGLISHNOBILITYMED...#RogerSomerydied1273
From link above:

ROGER [IV] de Somery, son of RALPH [II] de Somery & his wife Margaret Crassus (-before 26 Aug 1273).  "Rogeri de Sumery fratris Willelmi Percevall de Sumery" swore homage to the king for "terra quam predictus Willelmus Perceval de rege tenuit", adding that he was heir to “Nicholaus filius ipsius Willelmi”, dated 10 Jul 1229[1362].  An undated order, [28 Oct 1237/27 Oct 1238], records a fine made by “the men of Alrewas”, Shropshire, against “Roger de Somery their lord”[1363].  His parentage is confirmed by a plea in Staffordshire dated 1240 which records that certain land was inherited from "Gervasio Paenel cuidam Hawisie sorori et heredi", from her by "…de iste Radulpho cuidam Willelmi et fratri et heredi, et de Willelmo cuidam Nicholao…filii et heredi, et de Nicholao isti Rogero ut avunculo quia non habuit heredem de corpore sua"[1364].  The Testa de Nevill lists fees in Berkshire, dated [1242/43], which include "Rogerus de Sumery in Bradefeld i. feodum...Margareta de Sumeri in Bradefeld unum feodum predicti Rogeri...Willelmus de Englefeld in Englefeld unum feodum de eodem feodo"[1365].   A writ dated 26 Aug "1 Edw I", after the death of "Roger de Somery" names "Roger his son aged 18 at the Nativity of St John the Baptist in the said year is his next heir", provides for "lands…whereof Lady Anabel late his wife ought to be dowered", and records details of "the inheritance of Nicholaa de Albiniaco his first wife"[1366]. 
m firstly NICOLE de Albini, daughter of WILLIAM de Albini Earl of Arundel & his wife Mabel of Chester.  The Annales Londonienses name "Mabiliam, Nicholaam, Ceciliam et Isabellam" as the four daughters of "secunda…Mabillia…uxor comitis de Arundelle", specifying that "Nicholaa" married "Rogeri de Someri" and had "filium Radulphum qui mortuus erat ante patrem suum et quatuor filias, Margaretam, Johannam, Elizabetham et Matildam, Margareta nupsit Radulpho de Basset juniori, Johanna nupsit Johanni Lestrange, Elizabetha Waltero de Souli, Matillda Henrico de Erdyntoune"[1367]. 
m secondly (1254 or before) as her second husband, AMABIL, widow of GILBERT de Segrave, daughter of ROBERT de Chaucombe of Chaucombe, Northamptonshire & his wife --- (-after 26 Aug 1273, bur Chaucombe Priory).  A writ dated 26 Aug "1 Edw I", after the death of "Roger de Somery" names "Roger his son aged 18 at the Nativity of St John the Baptist in the said year is his next heir", provides for "lands…whereof Lady Anabel late his wife ought to be dowered", and records details of "the inheritance of Nicholaa de Albiniaco his first wife"[1368]. 
Children by Nicole d’Aubigny:
1. Ralph IV de Somery (d. bef. 1253)
2. Margaret de Somery (d. bef. Sep. 18, 1289); m. Ralph Basset
3. Joan de Somery; m. John IV le Strange
4. Elizabeth (Mabel) de Somery; m. Walter de Soulis
5. Matilda de Somery; m. Henry de Erdington
Children by Amabil de Segrave:
6. Roger V de Somery (Jun 24, 1255-bof. Oct. 11, 1291); m. Agnes and had three children
7. Perceval Somery (d. aft. 1277/78)