Giles Cooper was born in 1924 (date suppressed) in Welwyn Garden City.

Giles married Deidre Mary Stevens on Saturday 28 July 1956 in Friends Meeting House, Jordans, Buckinghamshire.

He had the following children from his marriage to Deidre Mary Stevens:

- Patrick Robert Cooper	born in 1959 (date suppressed) in Jordans, Buckinghamshire.
- Janet Francis Cooper	born in 1961 (date suppressed) in Jordans, Buckinghamshire.
- Catherine Mary Cooper	born in 1963 (date suppressed) in Jordans, Buckinghamshire.

Details of Giles's occupation are not known.