Thread:Nerdfightergirl/@comment-24137772-20131106150831/@comment-5278765-20131106184226

They use the term biological there, but adoption gives you the same legal relationship as a biological child.

Yes, if Jake had not adopted Henry, they'd be step-siblings, becuase they wouldn't have a parent in common. Addison did not adopt Angela, so Angela is her step-daughter, which is how it's listed on both their pages.