Woman Expects Sister in Law to Babysit for Free on Vacation, She Refuses, Exposing Her Brother’s Negligent Role as a Father

When it comes to free babysitting, no one should actually feel they're obligated contribute when it's not their kid. We're all aware of the notion that some people don't like kids at all, only their own, and some people don't even like their relatives kids! 
There's only a certain amount of empathy one can hold for others, and if personal boundaries are stepped over, then it's up to the person to redraw the line. 
In this reddit thread, it's about just that. The original poster (OP) is a woman who doesn't have kids, and frankly doesn't like them, even her nieces and nephews. Her family plans a big family vacation in a cabin, and her brother and sister-in-law come with their four children. Her sister-in-law, being close in age to OP, assumes that OP will step up and be a babysitter while on the trip. The woman is understandably exhausted, but truthfully, it's her responsibility. Read the full story below for all the juicy details.