Board Thread:Speculation House/@comment-3257939-20131111020445/@comment-14909251-20150123225452

Christopherweeblingjr wrote: 75.142.98.187 wrote: It's already been proven that they're half sisters. Same dad, different moms. But then they would still have the same last name.

Obviously, that means Ruby is a looooove child. I suppose after Taiyang was abandoned by his first love and left with a child, Summer got all close and helped out because they were all good friends and then one hot steamy evening they just did it. Ruby being the happy accident. Apparently, they either didn't get married at first (scandalous!), Summer did not let him know she was pregnant and left to have the child on her own (mysterious!), or it was something mundane like her coming from a family where the surname is passed on matrilineally (uninteresting).