May have been married to Margaret Suehagen, aka, Maggie Sneighigan, before Ella Dent:
Name: Marg Suehagen
Spouse Name: A Anthis
Marriage Date: 12 Apr 1882
Marriage County: Knox
In 1900 Census, Alvin has 2 daughters born 1884 and 1886 and then, after a gap of 5 years, Mary. Maggie died 18 May 1888:
Name: Margaret Anthis
Date: 18 May 1888
Location: Knox County
Age: 24 Yr
Gender: Female
Race: White
Source Location: County Health Office, County Health Office Edwardsport, Indiana
Source notes: The source of this record is the book H-26 on page 190 within the series produced by the Indiana Works Progress Administration. ( ancestry.com Indiana Deaths, 1882-1920 )