Two of my maternal ggrandfathers' (Worden E. Rees, son of Wm. R. Rees who was father to them all) half-siblings married Pulfords. I assume they were also sibs. Eliza Jane Rees married Thomas Pulford and they lived in Filmore county, MN when the 1880 census was taken. Eliza's full sister, Sylvia Rees age 15, was also living with them.
Eliza's younger brother Rufus married Lizzie Pulford.
I believe that two other Pulford brothers, William and Joseph A., lived in the same area of MN at the time of the census.
I'm searching for information on the Rees side of the family.