Who qualifies as family?

I have a family reunion coming up at the end of the month. My cousin thinks that this woman and her family is part of our family because they share a pass to the Springs Preserve. I think she is right because the pass says family on it and both their names are on it. But some people say that doesn't count. I... show more I have a family reunion coming up at the end of the month. My cousin thinks that this woman and her family is part of our family because they share a pass to the Springs Preserve. I think she is right because the pass says family on it and both their names are on it. But some people say that doesn't count. I am so confused. Should they be invited to the family reunion?
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