During the last few episodes of The Legend of Korra, the show page on Nick.com (the network for the show) included family trees of the major characters. It has since been taken down, but was preserved on this site. The Aang family tree is as follows:
I recognize all of these pictures as coming from an episode of either Avatar: The Last Airbender or The Legend of Korra, except that of Rohan. The picture is much brighter than the others, and I only recall Rohan being a baby in The Legend of Korra, but he appears to be older in this picture.
Where did this picture of of Rohan come from? Was it an episode? A comic book? Or is it unique to this family tree?