“Adopting Our Son’s Birth Sister” Matt Thompson - June 26, 2014 - Living with Openness, Openness, Real Adoption Stories, Referrals & Matches, The Process, Yours Free “Adopting Our Son’s Birth Sister” Matt Thompson - June 26, 2014 - Living with Openness, Openness, Real Adoption Stories, Referrals & Matches, The Process, Yours Free When we adopted our son’s biological sister, it felt both eerily similar and completely different.