Was I wrong to tell my sister in law this?

Nope, you are fully within your rights. And its time to start setting some boundaries! Your husband has to work at five, and she's not getting her brood until midnight? I'd say its time to start saying no to being a free(?) babysitter for the family from now on. That many kids at once is a handful, and it was VERY inconsiderate of them to expect you to drop your whole life just to watch the kids whenever they want.

You should also set a curfew for any future visits if there are any. If they can't abide by it, say 7 or 8 o'clock, then they don't get to drop the kids off anymore. You probably won't have to deal with it anyway, but you made a good call and stood up for yourself, not your fault if they don't like hearing the truth.

sounds like you created more of a problem than you solved, I know you want to hear that you did the right thing, but you did not. If you have problems about something maybe you would have been better off discussing the problem instead of throwing out your insult which it was. If you want to act like a low life you did it right. Way to break the family up good job, actually sounds now like you have a problem. Just my 2 cents worth

You're obviously jealous of your sister in law, so you used this rude thing to hurt her. Now that you've gotten what you wanted and they don't come around, you're still not satisfied. You're close enough to these people to have spoken to her husband first, when he didn't speak. Instead, you chose to create this confusion in the family. Whether you like it or not, this woman is your husband's sister and you should not have said such an ugly thing to her.

I wouldn't have said they were fake, but rude was appropriate and it sounds like they were using you as a baby sitter and if you weren't getting paid then the hell with that!

Wen they dnt knw their limits n lack manners y shud u bother!

So you babysit her kids and then complain about that? I don't understand why that chafes your backside so much.