Hanging out with my 16 step sister weird?

I was curious about this, like last weekend I took my step sister to this place called Lights of the world and when someone asked me who did I take. I would say my step sister and they be like how old are they and I'm answer 16. Then the conversation goes quiet, like what the hell. Do people think I'm like a perv that I hangout with her. I admit that I hangout with her a lot but that because we are close and can talk about anything with each other.
Hanging out with my 16 step sister weird?
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