Do you think genetics cam determine what sex your baby will be?

I know they say its a 50/50 chance, but from what I've seen, it must be a pretty big coincidence. My mom had a boy then a girl. Grandparents from both sides had a boy then a girl. My cousins mom had a girl then a boy, then my cousin had a girl then a boy. So do you think I will have a boy then a girl?
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