Details of Duncan's birth are not known.

Duncan married Wendy Thora Guard in 1983 in Lurgashall.

He had the following children from his marriage to Wendy Thora Guard:

- Kelly Lillywhite	born in 1984 (date suppressed) at Chichester.
- Lisa Lillywhite	born in 1988 (date suppressed).

Details of Duncan's occupation are not known.