If memory serves me right, it was a reference to an Irish political figure who put his nephew in as Chief Secretary (or some other sort of high level post) when the nephew lacked any real sort of qualification. Thus "Robert's your mothers brother" is a kind of 'it'll all work out for the best'. But I'm pulling from some fairly sketchy memories, so I might be a bit off base
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If memory serves me right, it was a reference to an Irish political figure who put his nephew in as Chief Secretary (or some other sort of high level post) when the nephew lacked any real sort of qualification. Thus "Robert's your mothers brother" is a kind of 'it'll all work out for the best'. But I'm pulling from some fairly sketchy memories, so I might be a bit off base