Namechanged as DH knows I'm posting this...
In June, BIL asked DH (electrician) if he'd do some work for him. The work would take about 1 week and, as they live 5 hours away, DH, DS and I would stay with MIL (who is lovely). She was thrilled about this as she has only seen DS twice since he was born (he is 5 months), and she is itching to spend time with him.
As we have a cat, we told BIL that we would have to see if we could arrange cat care. The cat is getting on a bit, and is quite fussy. I asked my dad (who has looked after her a couple of times in the past) if he could look after the cat at his house, and he said it would be fine. The only problem was that he was due to visit my sister and her DDs in the States - he does this 2-3 times a year. He said he was due back this weekend, and that he'd be able to take the cat at the end of next week.
It was a bit of a longer wait than he had anticipated, but BIL was okay with the work starting at the end of next week, and MIL was really happy that she would get to spend some quality time with DS.
Last night, my dad emailed to say he had changed his travel plans, and that he won't be returning for another couple of weeks. My sister has some blood tests, etc, and I suppose he wants to stay on to help with his GCs.
It was clear from his email that he had completely forgotten that we were relying on him to look after the cat. I know it seems petty when my sister is having tests, but it isn't anything life threatening and, to be honest, there is a long history of everything else taking a backseat when she 'needs' something (usually something trivial, like shopping or attention).
I'm really upset because we can't afford a pet sitter or a cattery, and the neighbours who normally feed the cat if we go away for a couple of days are on holiday (which is why I asked my dad). Cat is cranky and doesn't like being left alone for long periods of time. If my dad hadn't agreed to help, DH wouldn't have taken on the job.
I now have to spend the week by myself with DS, as DH can't let his brother down - BIL just can't wait any longer. MIL will be gutted when we tell her, and DH is annoyed because he only agreed to do the work so MIL could spend some time with DS. He also doesn't want to spend the week away from DS unnecessarily. DS is ebf, so taking him without me is not an option (not that I'd want to be without him for a week).
I'm also disappointed that I won't get to go away - I was really looking forward to having MIL's help for a few days. Everything was arranged and my dad just forgot
I don't want to upset my dad, but he has a bit of a habit of forgetting other commitments when my sister is around. I really want to say something to him, otherwise I'll just end up slapping a smile on my face and biting my tongue when he gets back (not for the first time), but I also don't want to make him feel bad.
So, AIBU for wanting to say something, or will it just upset him unnecessarily?