Ya know my younger sister was born in ... Munich, Germany in 1956 to two U.S. citizen parents and she was issued a DS-1350 and, I understand, she could have claimed her German citizenship up and until she turned 21, but she did not. But no matters as she is a Natural Born U.S. citizen.<quoted text>
You are in denial.
George Rmoney was born in Mexico and according to Mexican law is a Mexican citizen.
Now George Romney was born in Mexico to two U.S. citizen parents and moved to the U.S.(not emigrated) at age 9 (?). There is no indication that he claimed citizenship in Mexico.