When this woman is annoyed with her pregnant sister, she asks Reddit:
I (f23) have a sister Julie (f30). I have a camping vacation planned with my stepsister Eva (f27) and my stepmom Anne (f52).
We are all pretty outdoorsy people and planned to spend most of the vacation going on hikes through the woods and mountains and bike rides. I know that's not everyone's idea of relaxing but that's my type of vacation.
The vacation is planned for Spring next year. Now, onto where I could be an asshole. Julie asked us if she could tag along on the vacation.
She's currently pregnant with her first baby, and at the time of the vacation she'll be 7 months pregnant. Even before the pregnancy, Julie has never been an outdoorsy person and hates exercise.
It sounds bad but I think if Julie comes we'll have to spend the whole vacation accommodating her and listening to her complain, rather than actually do the stuff we planned.