The children of Abraham squabble and fight like the worst of siblings. They're closely related as a people if the religious texts can be believed. The picture above is a good one for showing the messed up family tree branching out from Abraham. Jews and Jesus are believed to descend from Isaac whereas Muhammad was descended from his older brother Ishmael. Ishmael's mother was Isaac's mother's handmaid, so that's an interesting relationship dynamic between the descendents.
