"Well, here's one at least that isn't, Shambles; but my sister-in-law is -- does that make me black by marriage?"

Does that make your sister-in-law white by marriage?

Why can't we all get along? Because some would rather make light of race questions being asked seriously here in the context of folk music of Britain and British North America with Polish jokes, and cutting remarks that trivialize the original poster's legitimate and very interesting question, that's why.

Which is also why, IMO, you don't see many black Mudcatters either side of the pond.