Did the US ever have a royal family?
The United States would never have existed without a monarchy, as the American revolution emerged as a direct retaliation to the tyrannical rule of the British Crown in the 18th century.
Revolutionaries brained freedom for the 13 colonies and established their own union, the product of which was the United States Constitution.
The constitution forbids the formation of a monarchy and keeps the US as a republic, but family dynasties have emerged nevertheless.