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Mrs Grenville was the wife, later ex-wife, of Gregson Grenville. Her mother warned her not to marry Gregson, and she wondered why she consented to marry Gregson when he had such a "contrary attitude" such as when he was unable to provide her with maintenance he "ha[dn't] got". When he wasn't sure if he was going to make it out of Deimos Moonbase alive, Gregson asked Tamsin Drew to tell his ex-wife that "she's still the beneficiary of my life insurance". (AUDIO: Deimos)