Details of Gemma's birth are not known.

Gemma married Raymond Greenhough in 1969 in Brent.

She had the following children from her marriage to Raymond Greenhough:

- Clive Raymond Greenhough	born in 1969 in Hampstead.
- David Leslie Greenhough	born in 1975 in Hampstead.
- Simon Donald Greenhough	born in 1986 in Brent.
- Sophia Carolyn Greenhough	born in 1987 in Hendon.