Why does my sister criticize what I do?

Im going to be visiting my sister this weekend at her trailer and want to bring my son and girlfriend. I enjoy having him and his girlfriend there and it doesn't bother me she comes along but my sister is asking why I tote someone else's kid around with me. I don't even know why she would ask me that. I was having a great night untill she said this. Why does it even matter what I do? It makes me feel upset and awkward about even going now. I would still like to go because I grew up at this camp and I enjoy being there. I was curious your thoughts? Thank you!
Why does my sister criticize what I do?
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