Would it be rude of me to cancel on my friends to go to my boyfriends moms?

I’m very stressed as I have recently moved into my flat. I planned for Friday for my 2 Friends to be coming round, although they can come whenever to see the flat. My boyfriends mom who I just met today gave me a invitation for Friday to a meal and said she’s booked me a spare seat and would love for me to come, his little sister also said she’d love it as it’s her birthday and that she wants to get to know me more and In a jokey way said ‘you have to come’ Me and my boyfriend are also expecting a baby boy and she’s said she wants me to come round to see the stuff she’s gotten for our boy on Friday. I feel really bad for cancelling on my friends am I horrible if I cancel on my friends? My boyfriend told me about the meal a few weeks before I made plans with my friends but I had no clue she was actually going to invite me. I feel like a terrible friend for cancelling them coming to see my flat but then I’d feel worse for turning down a invite to meet my boyfriends mom and get meet the family and get the gifts she’s got for our unborn baby?

Would it be rude of me to cancel on my friends to go to my boyfriends moms?
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