Thread:Nerdfightergirl/@comment-24137772-20131106150831/@comment-5278765-20131106154633

Biology doesn't make you a parent. If you look at the half-sibling section of that page, http://en.wikipedia.org/wiki/Sibling#Half-sibling, you see that half-siblings are those who share one parent, but not other other. Jake is Henry's father. Jake is Angela's father. They share a father. They don't share their mother's: Lily is Angela's and Addison is Henry's. By your definition of step-child, Zola is Meredith and Derek's stepdaughter, because she's adopted and their relationship is only social/legal, not biological. Jake adopted Angela and Henry, same as Derek and Meredith adopted Zola. Adopted children are legally considered offspring in all matters. Now I have to leave, but I'll be back later if you're not convinced and you need more evidence to believe me.