My dad renunciate his citizenship when he was 18 in 1966.He born in NY in 1946 and lived there for 2 years then move to brazil. I was born in 1988 and my parents were married at this time. My grandma is also an american citizen. Can I have my citizenship?
Not under the facts you provide.
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He was born a US citizen and at 18 went through the legal process of expatriating? I would be shocked if he did this legally. You may need to get an attorney and look into this.