F ISO Birthfam born 4/16/69 northhaven

Hi, I am helping my adopted sister find her birthfamily. We have been looking for a long time. My parents said she was brought to them at the agency in a baby bassinet (like at the hospitals) with a name sticker of "baby girl Robin" Not sure if this is a last name or first name or what. Have non identifying info. DOB 4/16/69 Birth father was said to have been married (not to bmom) with 4-6 kids??