I personaly think that the MU label in the 1880 census was a mistake for either Indian bloodline or a good tan . In previous and later census the family was listed as white
I myself being a direct decendent of Jonathan & Elvira Howe via their son Victor whom was the father of my grandfather Arthur James Howe Sr. ( 5/9/1897 - 7/23/1963 ) Have over the yrs heard that the Howe Family were of Irish and Indian decent . the irish came from my grandmothers side (Ryan Family ) directly from Ireland .
Anyhow as for Annie she was listed with johnathan & elvira in one census but was also listed with their son Edward sometimes listed as Edmond and Martha also listed as Maretia . i was guessing she annie was maybe living with jonathan and elvira part of the year that would explain the 2 Annies same birth yrs ,etc.. If there was 2 seperate Annies same birth yrs i have not been able to tace them . But i do know that jonathan lived until about 1900 (cem record.) elvira her self lived till 3/22/1903 (death certificate) I am still trying to track down Edward and Martha since 1880 .
as for jonathan and elviras daughter Mary A. Howe (8/31/1862 - 11/12/1936 )cem . record As far as I can tell never married she was a housekeeper / servant most of her life.
I hope that this does help you some and i would be currious to see if this Annie is the same person as well . as well to learn more about her and her family ties . If I can be of any help drop me a line anytime either here or you can contact me directly at email@example.com
Arthur James Howe III