Board Thread:General Discussion/@comment-4010415-20140421154105/@comment-3257939-20141116025412

That kind of scenario makes you think that both Summer and Raven (if she's her mother) had feelings for Taiyang. I see Ruby as the kind of girl who would focus more on her wishes than her love life and considering that Ruby is Summer's daughter, it's possible that Summer also had the wish of being a huntress and was focusing only on her career which as a result, caused her to lose Taiyang to Raven.

After Raven left, Summer was there to comfort Taiyang which might have triggered something that was already there. If Summer was so important to Taiyang that he shut down after losing her too, I bet that he already had feelings for Summer but forgot about those feelings because of Raven, and after she left, his feelings for Summer came back and they got together. Since both girls refer to Summer as mom, it's very possible that Taiyang married her before or after having Ruby.