This couple has stumped me before, and they are proving difficult again. Here is what I have been able to glean:
Sarah H. Tucker, the sixth child of Ezra and Caroline (Lanning) Tucker was born in 1847. She married Dewitt Burham Harvey between 1870 and 1873. They had one son, Howard Tucker Harvey (b: 16 September 1874). I believe Sarah died in 1875, after the census was taken as she is shown in that census living with Dewitt B. Harvey and his brother, Edgar B. Harvey.