I like my BIL (my sister's husband) just fine. He is one of those really laid back people, that it is hard not to like him. I don't really see him much though, a few times a year at most because we live far apart.
My other BIL (my husbands brother) I really can't stand. He's not a bad person, but one of those people that really takes advantage of others.
For example, they will call (he is getting married fairly soon, the soon to be SIL is ok) and say they are in a bind and can we watch her son for an hour. OK, sure, I guess it isn't a problem. Then we'll get a call a couple hours later and they've decided their going to go out to dinner, since they are already out and we don't mind watching the little boy for a few more hours do we. So what was supposed to be one hour turns into four or five. I know I could just say no, but I'm a wimp, I would rather just come on the DIS and vent.
Then, we'll ask them to watch our kids in return the following weekend so we can go out to dinner, and they say sure. But then we usually get a call the day of and they've decided to go out that evening so they can't babysit for us. I know they don't have to, but when you've made a commitment you don't break it just because you've decided you want to do something that evening.
It's just annoying. I try to avoid him as much as humanly possible (even though they live a couple of streets over)