In general though, children of the First Family have not had a political or even social role in the US.

John Eisenhower - During his father's presidency, John Eisenhower served as Assistant Staff Secretary in the White House, on the Army's General Staff, and in the White House as assistant to General Andrew Goodpaster.

Franklin Delano Roosevelt Jr. - At the request of his father, along with brother Elliott Roosevelt, he attended both the Argentia (Atlantic Charter) summit with Prime Minister Winston Churchill in August 1941, and the Casablanca Conference in January 1943. Franklin also met FDR in Africa prior to the Teheran Conference. Returning from Argentia, he sailed with Churchill and stood with him at parades in newly American-occupied Reykjavik, Iceland, to symbolize American solidarity with England, Scotland, and Wales.

James Roosevelt - Soon after the 1936 re-election of FDR, James Roosevelt was given a direct commission as a lieutenant colonel in the Marine Corps, which caused public controversy for its obvious political implications. He accompanied his father to the Inter-American Conference at Buenos Aires in December as a military aide. On January 6, 1937, he was officially appointed "administrative assistant to the President"; on July 1, 1937, he was appointed Secretary to the President.[2] He became White House coordinator for eighteen federal agencies in October 1937.