Hi, L L, I did find the Trevisan Family Tree on Ancestry which contains the Keliehor family. I asked the author to contact you.
Do yo have Nancy's obituary? If not, look at Random Acts Genealgical Kindness for a volunteer to look it up. Go to raogk.org, read guidelines, choose Texas, choose Bexar Co. and look for a volunteer who will look up an obituary.
OR Contact the Bexar County Public Library.
In 1870 William and his family were living in Contra Costa Co. but Nancy wasn't living with them.
In 1880 William and his family were living in Precinct 5, Williamson Co., Texas but Nancy wasn't living with them. Successful Searching!