Do you think this was really his cousin. I don't have family so do cousins do this together?

Guy I'm talking to, his cousin of the opposite sex came into town and he went for a nice meal with her then to a club, she's staying at his place and they stayed up till 6am and he said it was nice to see her and spend time and dance with her

Do you think this was really his cousin. I don't have family so do cousins do this together?
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