My dad passed away on April 29 of lung cancer. My SIL birthday. A friend forwarded me an email she sent to another friend saying "my crazy sister in laws dad died today. Yeah on my birthday. Couldn't he have waited for his own special day? LOL".
So I wouldn't say she is crazy but she is mean and cruel.
I'm so glad my brother's wife is wonderful. And her sister (sister in law in law?) is great, too.
My husband's family, however, not so much. They are the reasons we think about moving to Tahiti every so often, b/c we know they'd never come visit us.
Due to ridiculous circumstances, hubby was branded with "the liar" role early on in his family. He was also branded with the "sneaky irresponsible stupid" role. Because he was told he was a liar, he started to lie (getting punished for it anyway, might as well do it), but he lied about just ridiculous stuff. Meanwhile, his older brother was lying about something that was fundamentally him (and when it finally came out dramatically, it did cause a 5 year rift, so it's understandable why he lied). His mom and dad lied about their wedding date (FIL was married to someone in the states when he "married" MIL in Korea, and then had to get that ended, then he married her a couple years later) and that hubby's brother was FIL's son. MIL was pregnant by a soldier from a different country (she had some sort of USO type job in Korea and met a few guys) when FIL married her (they had met years ago when she was a child, during WW2, then re-met by chance and married). That came out during an argument between MIL and BIL, and she actually thought that slamming that in BIL's face, that FIL had cared for him all those years even though he didn't have to, would cause her to WIN the argument? And SIL omg SIL...she was a daddy's girl, but did the nastiest things behind her parent's backs...
But she ended up working as a social worker, which is noble and difficult, then was working in a halfway house with men just out of prison. Well, of course she fell madly in love with a convicted bank robber who was an active heroin user; who wouldn't? Had to quit her job, of course. And since he couldn't get a job (who would hire him?) they were broke for awhile. Then she got pregnant (who wouldn't purposely get pregnant by an active heroin user, right?) and her parents felt bad for her, and the forced "gifts' from my husband to her had to start. He gave her something like 2 of his cars (he would buy them used and fix them up, then his parents would make him give them away) and a 15 speed bike. She promptly destroyed the cars and mangled the bike. Parents gave her a brand new crib for each of her two children, and she sold the cribs. Mom gave her their baby grand piano b/c SIL wanted to play it...SIL sold it.
I swear, I'd love to sell stuff to the friends of her and her now ex husband, b/c their friends buy all of their furniture! We can't even successfully craigslist our stuff for anything...
Oh it just goes on and on...for the sakes of her daughters (good kids who were actually cared for by their dad during the day, and have turned out quite all right, surprisingly) hubby tried to smooth things out before our wedding. But she wanted to have a huge blow-out thing where she was allowed to tell him all that he had done to her and he was not allowed to defend himself (she actually told him that). ONly if that could happen would she attend. He refused, she refused to attend.
I was nice, I gave her name and address to my maid of honor to invite to the shower I was given...her husband called my MOH demanding to know who she was and who I was and blah blah blah...SIL didn't come and I felt awful that he knew MOH's address.
Of course now that SIL and he are divorced (which is a hugely long saga that mainly involved a year of me and DH saying "huh? that makes NO sense, you can't get a divorce that fast in WA with kids involved, why did HE get custody for several months? it makes no sense" over and over and over) SIL regrets not going to our wedding.
And now we have to do some gift exchange for the kids at the holidays, even though we don't celebrate the same holidays. And she has two kids with expensive princess tastes. So two xmases ago we got them a easy bake oven kit, which was promptly recalled. We told her but we don't know if she took it back for the credit. Last xmas she said that her oldest was really into skateboarding, and could we outfit her with helmet and kneepads. Well we're big into safety so that meant some $$! And I forget what the younger one wanted, but we got it. And when they had the exchange of gifts (I don't deal with my MIL anymore, they meet up on their own) Dh came home with some game with marbles and plastic building game thing that they got for DS...not *quite* on the same level as the gifts we gave her girls...
So yeah, I have a weird SIL (and BIL is more normal but still makes horrid decisions).