My MIL and SIL and her family was supposed to come around for Christmas. No word all day til 2 days later when yesterday she called and said she would be round to exchange presents. We stayed in all day waiting, and nothing. My family felt hurt and upset that we meant so little that a little phone call to say they wouldn't be coming was far too much trouble for them.
In my line of work I am able to get coach tickets for day excursions. I am sending my MIL and her partner on an excursion (lasting half a day) as a christmas present and now my SIL has asked me if there is any spaces so she can go. There are, but I told her there isn't as i'm still bitter about them standing us up at Christmas. I don't think she will ever be able to find out otherwise that there are still places available, but am I being mean?