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so ultimately the question is "why use 'father' as the metaphor?" which as you are pointing out here should, at the very least, be a couple and as i am pointing out, for 99.9999+% of species the mother HAS to be present at birth (or at least egg laying) and then for most mammals the mother HAS to be present for nourishment (basic nature - not things like adoption - if the mother dies at childbirth or soon after that's like a near certain death sentence whereas the father does not need to be present for survival)Biologically there is no mother without a father and vice versa.