Stephen Albert Allen is the son of John Lane Allen and Phyllis Muriel Martin.

Stephen was born in 1939 in Wednesbury, Staffordshire.

Stephen married Mary Elizabeth Austin in 1964 in Wednesbury, Staffordshire.

He had the following children from his marriage to Mary Elizabeth Austin:

- David Stephen Allen	born in 1965 at West Bromwich, Staffordshire.
- Jacqueline Mary Allen	born in 1967 at West Bromwich, Staffordshire.
- Elizabeth Rachel Allen	born in 1980 at Birmingham, Warwickshire.

Stephen was a Chartered Accountant.