Robins was born Denise Naomi Klein on 1 February 1897 in London, England, the daughter of Kathleen Clarice Louise Cornwell, who was also a prolific author who wrote under several names, and of her first husband, Herman Klein, who was a professor of music and journalist. Of Russian Jewish ancestry, he had been born in Norwich in 1856.
Denise Naomi Klein was born in London, England, on 1 February 1897. Kathleen Clarice Groom was her mother, who was a gothic novelist and Herman Klein was her father, who was a musical composer. Denise had an unhappy childhood after her parents divorced. Her parents had married in the year 1890 on 19 February at the West London Synagogue. Her mother was an Australian born heiress, while her father was an English music teacher, author and critic of singing. Her mother was 16 years younger to her father.
Sibyl Klein was Denise’s half-sister, who also became an actress. The family also had Adrian Bernard L Klein and Darl Kleyn, her two older brothers. Adrian Bernard L Klein changed his name later to Adrian Cornwell Clyne. He was born in the year 1892 and died in the year 1969. he was a writer and he wrote books on cinematography and photography, while Darl Kelin was born in 1894, two years after Bernard.
Denise Robins had an unhappy childhood because her mother had an affair during their marriage with a Worcestershire young Regiment officer born in the year 1878. He was Herbert Arthur Berkeley Dealtry. However, when her father, Herman Klein, came to know of this, he filed a divorce petition and this was availed in December 1901. Her mother, Kathleen Clarice married Dealtry, the next year after the divorce in 1902, but faced severe financial difficulties to the extent that they were declared in 1905 bankrupt. This was the year her father remarried a Christian Science Boston, Massachusetts practitioner, Helene Fox.
Kathleen Dealtry began publishing her writings and short stories in magazines. She also began with gothic novels. Few years later, her mother was single again and she returned to London and remarried in 1918 with Sydney H Groom for the third time and began signing her novels in the name as Mrs. Sydney Groom or C. Groom. Later, Naomi also left school and follower the footsteps of her mother and took to publish her writings.