SIL, BIL and everyone else in DH's family seems to get neice and nephew noisy toys (also completely age INappropriate if you ask me). SIL deliberately leaves them at FIL's house (even if she bought them!) since he watches the kids one day each during the week. We live with FIL and I'm pretty sure all the noisy toys are here. 
SIL also leaves toys here that we get the kids, so it really seems like she doesn't like them (or us, but I'm not bothered by that), even if the toys are quiet and cuddly. Other toys get brought home, but whatevs.
Actually, she did bring home the cuddly toy we brought first born.... Then when second born came, she had first born give that exact cuddly toy to second born as a 'gift to the new baby'. 
I'm pretty sure the tags were still on, too... which makes it definitely NOT cuddly. She's training regifters and she's not even hiding it!
Don't get me started on the Christmas gift we've given her, still in their original packaging years later at FIL's house (along with loads of stuff she's bought herself which is stored in the room we're sleeping in even though she's got a house of her own) and probably well out of date. We stick to cards now. A bit lame, but I'm not going to stress about a gift if she doesn't want it.
Phew.... that felt good to get out.
Wow... it's like she's trying to send a message. That is some rudeness. Do you get along with them, otherwise? Is she hostile, or just thoughtless?
We tolerate. I wouldn't say we get along.
If I were judging just by her interactions with me, I'd say she's friendly, but isn't a friend.
Since DH shares his interactions with her (like texts to him where she was 7 months pregnant and said we were stressing her out and risking the life of her unborn child, more texts saying that we didn't love her kids and basically that we were horrible people) and apparently she told FIL that he didn't love her kids enough (which is probably why uses his days off to babysit them... even though SIL had one of those days off, too...).
She can seem friendly, but she can be quite aggressive. When FIL was in hospital last year, she drove grand-FIL, DH and me to the hospital. On the way, she told DH (not in English, so I couldn't understand) that I shouldn't go into the room to see FIL and should wait outside. We were going to visit him because they didn't know if he'd make it! DH texted me in the car so I knew, but I was still went to the room to visit him because if I don't feel a part of this family, I don't have any family nearby (besides DH). Since then, we've tried to steer clear of her but since FIL watches the kids, she's usually over a day or two a week and we live with FIL and I work from home. I keep to myself and try to minimise my time downstairs when she's over, but it's still painful.
Basically, I don't really get on with her or worry about getting on with her. I'm not going to be rude to her, but I'm not going to stress about anything.
We just got back from holiday (thus the late reply to this post) and when DH was looking for toys for the kids and asking my opinion (I've worked a lot with kids), I told him I don't want to bother with it. Yes, we get the nephew on my side more stuff (postcards and toys in packages for their whole family) so maybe I've got a favourite nephew, but my family actually seem to appreciate the stuff we do for them and reciprocates. I can't say as much for DH's family.
This all extends to the rest of their family, too, to some degree. I've told DH that I'm not going to stress about anything. I'll wish the best for everyone, but if FIL (who just had major surgery) is drinking, getting fast food for dinner or doing something when we think he shouldn't, I'm not going to step in. We've tried that many times before, stressed over it and he hasn't changed so I've stopped intervening or trying to help anyone without being asked.
I usually give people the benefit of the doubt, but seriously, they're just a bit messed up.
I imagine if/when we move away, no one from his family will come to visit... which I'm not bothered by in the least. They'll be welcome to visit, but if they don't, I won't mind.
Thanks for listening. Working from home and not having much of a support group here in the UK makes this outlet awesome for realising I'm not the bad guy (although I know SIL's probably seeing a perspective where we might actually be the bad guys).
