Board Thread:Speculation House/@comment-24177652-20141114041512

So, by this point we should all know that Summer Rose is dead. We know that she went out on a mission, and never returned. Yang was sad, Taiyang was broken, and Ruby, as young as confused as she was, knew something wasn't right.

Now we don't know for sure what her mission was, or what it entailed. But, I think we can gather some clues. In the lyrics for Red Like Roses II The part sung by Summer seems to allude to That she knew that she was going to be going on a dangerous mission, a mission she knew she had to do. But she had hope that she'd be able to see her daughter again. Apperently this was not the case.

Now, in the poem The Last Rose of Summer, where we get Summers name from, the entire poem seems to be about  Loniness, loss, and abandonment.

This makes me think that everyone else, Taiyang included, knew that Summer was not going to make it back from this mission. Leaving him more broken for having to abandon his second wife.  