What call sign is used for the President’s family when aboard any aircraft?

The call sign used for the President’s family when aboard any aircraft is "Executive One Foxtrot." This designates that the aircraft is transporting the President's family specifically. The term "Executive One" generally refers to the aircraft when the President is on board, but when it is designated for family members, the "Foxtrot" suffix indicates that it is not transporting the President himself.

In contrast, "Air Force One" is the official title used for the specific aircraft that the President is aboard and is not applicable to family members traveling separately. "Presidential One" is not an official term used in U.S. aviation or protocol, and "Executive One" alone does not sufficiently differentiate between the President and family members. Therefore, "Executive One Foxtrot" accurately captures the designation while clearly signifying that it is an aircraft designated for the First Family.