My irritating Sis-In-Law

How could they do that?? Cannot agree with my brother and his wife's act. Mom was away this few days and I have to take leave to look after my kids and send Derrius to classes. My "no-cheek" sis-in-law simply go to work (or maybe go shopping which she always lied???!!!) left her two sons and maid at home. Ryan called my dad at 12:30pm today asking him to buy nasi-lemak and noodles for them. I was quite shock, what are they taking my dad as? On call delivery man? Can't their parents take care of them, if not can't their parents have the courtesy to inform my dad in advance? They have been preaching self independence, have been "threathing" my parents that they want to send their kids to the childcare and they can handle their kids well, so what now??? My mom is only away for THREE days and they can't even take care of their own problem? My that good for nothing sis in law, should be thankful to have such good parents in law, everything is done for her, she still have the cheeks to say things behind my mom's back!! She is so STUPID to have said that to my auntie (i.e my mom's sis). She used to be stupid, guillible and dumb which people tends to forgive her acts, but now she has grown "older' in her brain, she has since hated by people around her, which is ME.