Пелагея was born on October 2nd, 1904 and her christening took place on October 2nd, 1904. Her godfather was Михаил Алексеевич Галанкин and her godmother was Анна Даниловна Карлина. Пелагея's father was Пётр Николаевич Галанкин and her mother was Ирина Апполоновна (Галанкина). She was an only child.