Hi,
Keturah Rossiter was born Keturah Walker, as mentioned earlier in the thread. I think she was the daughter of Alfred Walker and Harriet Verney whose marriage is recorded in the MAR Qtr 1860 in Winslow Registration District, which is the same district where Keturah's birth is registered in the JUNE Qtr of 1862.Hope this helps.
Best wishes, ancuseruk