Yes, this describes a half-cousin. When 2 people have a common ancestor, but are descended from different spouses of that common ancestor, they have a "half" relationship.. On Feb 9, 2008 7:20 PM, John Sandy <ned7298@sbcglobal.net> wrote: > Is there a relationship known as 1st half-cousin? The situation arises with the following relationship I'm trying to describe: Clara is the daughter of William who is the son of Jonathan and his first wife, Nancy. Nancy dies and Jonathan marries Julina and they have several children, one of which is Mary. Mary marries and has a son, Pete. Pete and Clara, therefore, have the SAME grandfather (Jonathan) but different grandmothers. Now since they have a common grandfather, there is a First cousin relationship BUT since Clara's father, William, is a half-brother to Pete's mother, Mary, are Pete and Clara just 1st cousins or 1st half-cousins? -- Mesa Mike LA de NM