Indiana Jones and the Last Crusade made the brilliant decision of introducing Indy's father Henry Jones Sr. to the mix. Henry helped his son chase after the Holy Grail and keep it out of the Nazis' hands. Along the way, they rediscover their relationship and address how they became estranged in the first place. Henry Jones Sr. was played by legendary actor Sean Connery, and his chemistry with Harrison Ford was easily one of the best elements of the entire franchise.
Source：https://www.cbr.com/indiana-jones-father-son-arc-strongest-story/
