Zircon Jim Laffer was Larry Laffer's great-great-grandpappy (or his great-great-great uncle; history is unclear on the exact relation) from the late 1800s..
It is believed that Zircon's brother Ezekial Laffer had a son who beget Ethan Laffer, who begat Bartholomew Laffer, who begets Lawrence Laffer (Larry Laffer).
It can be assumed though that both Zircon and Ezekial slept with the same woman who birthed Ethan, and that true father was unknown.