How to determine if a person is a citizen

Hi Everyone,

I apoligize in advance if this doesn't fit in the correct area of the chat board. I'm wondering how I can figure out if my wife is a citizen of the US. Both of her grandparents were citizens and her dad was born in the US and is also a citizen. She has never lived in the US and was born in Canada.

Any suggestions?

Thanks

If her father is a US citizen but her mother is not, she is also a US citizen but only if her father resided in the US for at least ten years (five of which had to be after the father turned 14 years old).

Good place to start is with USCIS

her dad was born in the US and is also a citizen.

Depends on how long he lived in the US,

The following shall be nationals and citizens of the United States at birth: (..) a person born outside the geographical limits of the
United States and its outlying possessions of parents one of whom is
an alien, and the other a citizen of the United States, who prior to
the birth of such person, was physically present in the United States
or its outlying possessions for a period or periods totaling not less
than ten years, at least five of which were after attaining the age of
fourteen years.