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http://en.wikipedia.org/wiki/Louis,_Dauphin_of_France_(1729–1765)#Early_life_and_education

He was bitterly disappointed when his father would not permit him to join the 1744 campaign in the War of the Austrian Succession. When his father became deathly ill with fever at Metz, Louis disobeyed orders and went to his bedside. This rash action, which could have resulted in the deaths of both Louis and his father, resulted in a permanent change in the relations between father and son.

WI both the king and the dauphin died within a short time of each other?
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