Why did these people laugh at me and did I say something dumb?

So my wife and I are Canadians from Canada and we recently went on a cruise. Well on the cruise we met some people from California and when we were talking , I asked them if they knew my cousin who Also lives in California. After I said this, they all began to chuckle with laughter. I didn’t think it was funny,... show more So my wife and I are Canadians from Canada and we recently went on a cruise. Well on the cruise we met some people from California and when we were talking , I asked them if they knew my cousin who Also lives in California. After I said this, they all began to chuckle with laughter. I didn’t think it was funny, what was so funny?
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