What about, FitzWalter, (Miles FitzWalter), for father and children, then 'Of Gloucester' for father, and 'Of Hereford' for the children in CLN?
* Royal Ancestry by Douglas Richardson Vol. I. p. 402: Margaret (or Margery) Of Hereford, daughter of Miles of Gloucester (also known as Miles Fitz Walter, 1st Earl of Hereford.
* Royal Ancestry by Douglas Richardson Vol. I. p. 415: Eleanor, was co-heiress in 1230 to her father, by which she inherited the manor of Denford, Berkshire, as well as 1/4th share of a 1/3rd share of the barony of Miles of Gloucester.
* Royal Ancestry by Douglas Richardson Vol. II. p. 82: Eve, was co-heiress in 1230 to her father, by which she inherited a 1/4th share of a 1/3rd share of the barony of Miles of Gloucester.
* Royal Ancestry by Douglas Richarson Vol. II. p. 645: Margaret (or Margery) daughter of Miles of Gloucester, 1st Earl of Hereford, Constable of Glioucester.
Name Fields for European Aristocrats
7. CURRENT LAST NAME: For nobility, the country, dukedom, etc., may be used here, with a preposition, as for example, of England or de León.