Harriet Cassandra Willoughby (who married Henry's brother-in-law, Godfrey Wentworth Bayard Bosville, de jure 13th Baronet); and the Rev.
He was appointed Honorary Colonel of the 1st Administrative Brigade of Yorkshire (East Riding) Artillery Volunteers on 17 December 1862, and his son the Hon.
Digby Willoughby, (later 9th Baron), a former captain in the Scots Fusilier Guards, was appointed second major in the brigade on 30 July 1869.
The 9th Baron later commanded the unit as Lt-Col, became Honorary Colonel in turn on 29 May 1879, and held the post into the 20th Century.
Julia was the daughter of Alexander William Robert Bosville (the eldest, but illegitimate, son of the 3rd Baron Macdonald and Louisa Maria La Coast, herself purported to be the illegitimate daughter of Prince William Henry, Duke of Gloucester and Edinburgh).