Talk:Summer Rose/@comment-26499992-20151024162614/@comment-4010415-20151024224755

The most obvious explanation is that Taiyang and Summer weren't married when Ruby was born. Even in real life, there are women who have their child take her last name if she births the child out of wedlock.

I wouldn't be surprised if Ruby was an accident, after a moment of weakness on Taiyang's behalf led to a night of passion.