Details of Keith's birth are not known.

Keith married Margaret Sewell on Friday 6 March 1964 in the Preston Registration District (Mar. quarter).

He had the following children from his marriage to Margaret Sewell:

- Claire Louise Malcolm	born in 1969 (date suppressed) in the Fylde Registration District (Mar. quarter).
- Richard Clark Malcolm	born in 1971 (date suppressed) in the Fylde Registration District (Dec. quarter).

Details of Keith's occupation are not known.