My bf saw my sister in law giving both

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Ok so idk if I’m right or wrong but today my sister in law was having a baby and my bf saw the entire thing. I just find this weird and I can’t see him the same way. I can’t imagine her husband and her 22 year old brother with her.

Please don’t be rude I just wanna know if this is normal or gross. I’m wondering because I am a woman and I would get gross out watching a baby come out of my sister vagina . 🤢🤢🤢