If you are born in one country but your family is from another country what nationality does that make you?
It depends on the rules of the various countries. The rules in the United States are that if you are born here, you can claim US Citizenship. If you are born of US parents in another country, you can claim American citizenship. Those born in another country are typically required to 'pick one' when they reach the age of majority. It is possible to have dual citizenship, or legally obtain a passport from other countries, but it isn't recommended. Your nationality ois dicated by the country in which you were born. If your brother was born in June, that doesn't make you a Gemini.