My high-school French teacher was French.
At least we always thought he was.
A few years after graduation he passed away, and sometime after that a tradesman I knew did some work on his widow’s house. He made the rather interesting discovery that he wasn’t French!
According to the widow the two of them fled Hungary ahead of the Soviet invasion in 1956.
Does this mean I speak Hungarian?
I knew a Hungarian couple like that. After they fled Hungary, they made their way to the US, but slowly and in stages. The couple made the effort to learn the languages of the countries they stayed in. The wife ended up being nearly fluent in French, German, and English.
I took a refresher course in French at a college in Atlanta before going on a trip to Europe. One evening the instructor told me that I spoke French with a southern accent. I laughed and said “this is the south”, but she replied that she meant my original teacher, back in college, must have been from the south of France.