In Indiana Jones and the Last Crusade, it is revealed that Indy has always had a very strained relationship with his father, who is a professor of medieval literature, as his father always seemed more interested in his work, specifically in his studies of the Holy Grail, than in his own son, although his father does not seem to realize or understand the negative effect that his aloof nature had on Indy (he even believes he was a good father in the sense that he taught his son "self reliance," which is not how Indy saw it).