I am so over my sister in law, I have absolutely no use for her.
Alright, I can get behind that. Sisters-in-law are usually angry messes of human beings anyway, so I'll back you up on that. What did she do though?
She's a special ed teacher (good person right?), but can't take any time out of her life to actually raise her two boys.
Yeah that's pretty unacceptable. As a former teacher myself, I can assure you that as much as I loved those kids, my kids would always come first no matter what.