Board Thread:News and Announcements/@comment-6533159-20151015224111/@comment-14138255-20151018152145

My headcanon is that after Raven left, Taiyang had no one look after Yang while he worked, but Summer (who may have had a crush, which she put aside when Taiyang and Raven got together) volunteered to look after Yang while he worked. They got closer until eventually Summer ended up not going back home and stayed with Taiyang (ending with them married and Ruby).