SIL used to live at the opposite end of the country so we'd only see her on big occasions like easter, Christmas etc. Which worked out fine, we always got on fine and I enjoyed her company.
A year ago SIL moved less than 15 mins drive away and in that time many things have happened which have drastically changed my opinion of her and her DH. It would be too outing to say what exactly, but they have both made multiple dick moves (IMO) that just put me off having a close relationship. He's more of a dick than she is, but still I find her difficult to be around.
SIL keeps asking to meet up and I don't know how to respond other than "I'd rather not thanks". DH works different days to SIL so they can rarely meet up in the daytime with the dcs to catch up and my in laws seem to think it falls on me for the cousins to be close. But frankly I'd rather not spend time with someone who I'm not that fond of on my precious day off with my young dcs. Plus my toddler dcs aren't that bothered by their cousins and are closer to their own friends.
To make it even more awkward MIL is amazing and would be really hurt if I made things awkward by not just sucking it up and going along with it. I'm closer to her than my own DM and she really is lovely but she can't take any criticism of her dcs at all, so I can't even be honest and gently say why.
Whenever I arrange to meet MIL she often just invites SIL or she's there to meet us all. Which has made the meet ups with MIL less as a result and the dcs are constantly asking to go and see her which previously I would have loved to do but now I dread.
I also have a habit of holding onto things when people have behaved poorly, I'm working on it but it makes me doubt myself sometimes. In a nut shell they have been grabby, painfully tight (not poor) and pretty judgemental towards others. I don't think they're horrible people, just not someone I wish to socialise with frequently. DH is usually incredibly laid back about most things and even he said they've behaved quite poorly over the past year but she's his sister so he's willing to ignore it.
What do I do here?!