Was Zedekiah Nebuchadnezzar's brother or uncle?

How was Zedekiah related to Nebuchadnezzar?
Zedekiah was Nebuchadnezzar's uncle.	Zedekiah was Nebuchadnezzar's brother.
2 Kings 24:17 And the king of Babylon made Mattariah his father's brother king in his stead, and changed his name to Zedekiah.	2 Chronicles 36:10 And when the year was expired, king Nebuchadnezzar ... made Zedekiah his brother king over Judah and Jerusalem.