Du You
Du Cong came from a prominent aristocratic family, with his grandfather Du You having served as a chancellor during the reigns of Emperor Dezong, Emperor Dezong's son Emperor Shunzong, and Emperor Shunzong's son Emperor Xianzong. Du Cong's father Du Shifang () was Du You's second son, and served several terms as minister or regional governor. The famed poet Du Mu was his cousin (son of Du Shifang's brother Du Congyu ().