As a royal family member, inheriting the throne is one of his birthrights.

birthright 是由 birth（出生）和 right（权利）组成的复合名词，字面意思是"与生俱来的权利"，指因出身而自然获得的权利或特权。在王室语境中特指出生时就享有的继承权等特权。