1) Look here. (http://trainwreck.ggkthx.org/2008/08/07/character-age-birthday-etc/) You might have to use Google translator for a few of the names, though.
I've never really seen a family tree anywhere before. The closest out there I can think of is the just the Wikipedia entry on the series here and the Code Geass Wiki article about the royal family here. But both only go as far as the characters seen in the series itself.
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http://i41.tinypic.com/2chx0mp.jpg
These scans have the birthdays for characters underneath their names.
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You might have to use Google translator for a few of the names, though.
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