Dirck Halstead/Getty Though they were best remembered as political rivals, Presidents Jimmy Carter and Gerald Ford formed a tight bond behind the scenes — one that would span decades.

The son of the late President Gerald Ford delivered a posthumous eulogy that his father wrote to deliver at the memorial service for former President Jimmy Carter. Ford died in 2006.

President Biden will deliver a eulogy, and tributes written by Gerald Ford and Walter Mondale will be read by their sons.