Is it weird going to my friends bfs family parties?

My friend invited me to go with her to her bfs cousins party and i told my bf I was going (I tell him everything) and he just thought it was weird and gave me a scenario of going to one of his friends gfs family party & I thought that was weird but yet I don’t find it that weird going with my friend to her bfs family party. Is it just a girl thing ( like it’s normal for girl-friends to do)?

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