I decided to go page by page with the District 51, Livingston County, Missouri Census of 1850 to see if any Brumets were neighbors. Eighteen households before James Taylor and Mary Bromett appear household #394 (entry 16), William Brumet and his wife Sarah. Could they be Sarah Jane Taylor’s maternal grandparents?
I also found this record of marriage for William to Sarah “Sally” Evans in Chariton County, Missouri 1827. Maybe Mary Ann Bromett named her daughter Sarah Jane Taylor after grandmother Sarah Evans?