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In the novel Sparkling Cyanide, Hector Marle was the father of Rosemary and Iris. He had an elder half-sister, Lucilla Drake, the daughter by an earlier marriage. After Hector's own mother died, Lucilla took care of her half-brother. Hector was thought of as being "weak, vicious and a drunkard" but he did manage to marry Viola Marle, beating the competition, a wealthier man by the name of Paul Bennett. Hector died when Iris was five years old.

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