Thank you, Sandra & Carol, for your replies. Family stories are that adoptive father CC Armstrong threw out any references to Nettie's family due to ire over sister's running away. I searched for an Armstrong/Martin marriage and for Nettie's family in 1870 census when she would have been 2, but no luck so far. I'm suspecting Nettie's mother may have been CC Armstrong's sister-in-law instead of sister but haven't found the mother that way either. The reference to Nebraska consists of a Hymnal book with Nettie's handwritten remarks dated 1875 Nebraska when she would have been age 6 or 7 (born 1 Nov 1868).