If your question refers to the movie, Jamie Campbell Bower portrays Jace Wayland in City of Bones.
If you are asking in reference to the books, Jace Wayland is the son of Stephen Herondale, though he was, at one point, thought to be the son of Michael Wayland and then Valentine Morgenstern. He is part angel, which is a result of Valentine's experiments. He was thought to be the brother of Clary, but was mistaken.
I will leave it at that because I do not wish to completely spoil the series.
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Jamie Campbell Bower
read the series and find out :) there are 6 books!
She dies in Jace's arms, telling him "your father would be proud of you", meaning Stephen, although Jace at first assumes it was Valentine she was talking about.
January, 1991 (we are unsure of the day)
Yes. it says he plays the piano a few times in the books