I just need to rant : Me and my mom have been cooking dinner for a long while, while my sister in…

I just need to rant : Me and my mom have been cooking dinner for a long while, while my sister in law doesnt do shit...ever so we both decided neither of us are cooking tonight, which leaves her to do the cooking but she's cooking something only me & my mom know how to do. (we told her how) Out of nowhere my brother asks her if she wants to learn how to make pudding pops, and she says, "No, I don't want to learn anything that I don't already know how to do" (referring to dinner because she didn't know how to before) . it may just be me but she really gets on my damn nerves, she's so lazy, never does anything. never cooks, cleans, gets pissy when she can't just sit on her tablet and ignore everyone including her kids. REALLY? I just wanna smack her tonight.