Why was the relationship between George Washington and the Marquis de Lafayette compared to that of a father and son?

The relationship between George Washington and the Marquis de Lafayette is often described as a surrogate father-son bond because of their distinct personal circumstances and mutual respect during the American Revolution.1

Washington was a childless commander in chief, while Lafayette was a young, orphaned French aristocrat who arrived in America at age 19 to fight for the cause of independence. Despite being an "unlikely pair," Washington was deeply impressed by Lafayette’s character and abilities as they served together in the Continental Army. As they spent more time together, their professional connection evolved into a close, lasting personal friendship that mirrored the dynamics of a father and son.12