I have, via DNA narrowed my grandmother's mother to one of two ladies. DNA matches both. Family stories say the younger sister, birth record says older sister and husband. I have reasoned in my mind that the 16 year old gave birth and the older sister who was married that week and her husband took the baby to Spokane, WA

( the big city), on their honeymoon and placed her in the orphanage.

I have found via DNA a possible birth father, but then the new husband's sir name has strong DNA too. Any ideas on how to narrow this query down?

I have done Ancestry DNA, Family Tree DNA, My Heritage and CRI Genetics with my aunt and uncle plus numerous members of my family.