Is it weird for a girl to sit on her brother's lap?

So the other day I was sitting on my younger brother's lap on the couch because there were no more seats left, and later my friend told me she told me she thought it was creepy...I'm 16 and he's 15, and we've always been really close, and I've sat on his lap before like in packed car rides and all with family and never thought it was a big deal.

What do you guys think?

Is it weird for a girl to sit on her brother's lap?
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