I am searching for information on William Henry Richards (b. 1856 in Cornwall, d. 1933 in Platteville, Wisconsin) but am pretty much at a brick wall with him.

His grave shows that along with his wife, Ellen, he is buried with Joseph and Mary. This appears to be Joseph Henry Currie Richards and his wife, Mary Elizabeth Williams.

I've found lots of documentation about Joseph's family but can't find his connection to William. They don't appear to be siblings but I can't find anything to indicate they are cousins, or at least first cousins.

I thought if I could find the family connection between Joseph and William it might help me break through the wall I've hit with William. Any ideas?