@Lustig Andrei,
sometimes new threads appear so quickly that important/interesting ones slide down the page too quickly
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I'm very interested in language survival - on a theoretical basis and also a personal one.
hamburgboy and his late brother spoke Hamburger Platt - it really was the form of German I knew best as a small child. When I went to Germany in my teens and visited with family in Hamburg, one group of cousins always commented that it was like having a live documentary in the house as I would speak Platt with their dad. They had no knowledge of the language - couldn't speak it, couldn't read it.
they didn't know what to make of this when I bought it