My SIL is extremely entitled and gets basically everything handed to her. She is currently has 3 kids (8, 2,1) and pregnant with her fourth. She has never paid for childcare because people always watch her kids for her for free. (must be nice I know). I'm a teacher and have off summers, I have a 2.5 year old and am 35 weeks pregnant and it's been a pretty brutal pregnancy, especially this final stretch. She keeps asking me to watch her kids for her, all day 8 hours, on top of my own, at her house.... for free. I am all for helping family out and have watch the kids earlier in summer and in past when she's desperate but enough is enough, she has no discipline and her 2yo is beyond a nightmare, I love him yo death but JESUS. I'm exhausted and don't wanna deal with 4 kids rn let alone for free. And to be petty fuck off dont work if you don't have reliable childcare or can't afford daycare. I feel like such a bitch but she asked me to watch them 3 days this week (I have Dr appts luckily and can't) and next Monday for 10hours. I texted her today and said I can do the second half the day but I don't have it in me. I'm waiting for the nasty texts OR for her to not talk to me for a few weeks because I said no.

Am I the worst person and aunt?!