I came across this on Youtube. It’s a three-part video compilation explaining the origins of each of the families from the show. They are voiced by the actual actors and make for fascinating viewing, particularly if you haven’t read the books.
This is part 2, and runs for little over an hour.
Watch part 1 by clicking here.
Watch part 3a by clicking here.
Watch part 3b by clicking here.
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Find more by clicking on the links below.