Robin was not suffering from clinical depression

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He was a man who loved his children, who never castigated them for their faults and was working full-time to support them, despite his wife's oddity, whom he also never chastised. The idea that he would kill Arawa, who was following in her father's footsteps professionally is absurd, as is the idea of him harming any of them in any way.

I think whether or not Robin suffered from depression or just felt out of sorts from time to time is very much a side issue. In my view he had a sunny personality like Arawa and Stephen, whereas Margaret always said Laniet was the child most like herself.