2007: Bob's Your Uncle Jun 13, 2020
There are a number of phrases like "I'll be a monkey's uncle" and "Bob's your uncle" that on the surface seem weird—and they are—but at least with the latter example, there is a reason. It is generally understood that the Bob in question was Robert Cecil (of the 19th century) who promoted his nephew AJ Balfour to many key governmental positions. He was underqualified for much of them, and many ascribed it to the fact that "Bob's your uncle", as in "and there you have it".
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