So I think I am probably being UR, but I do have good reasons.
The first weekend wasn't a change, DS had plans so I said 'no sorry he can't maybe next week' when they asked.
Then last week I forgot that we had arranged to go to a barbecue, I said he could still sleep over, they would just have to pick him up after dinner at around 6.30. But they said there was no point in having him if they couldn't have him for the whole day to 'do something' and said they would have him next week instead.
Except it is my SILs birthday on Saturday and she has organised a big family picnic for 2pm on Saturday.
DS has to and wants to come.
I know I have to just say that we are busy, but I feel UR for saying so.
I am more than happy for him to go there after the picnic, or for him to come for a short while and then let then pick him up at 4-5pm. But they won't be happy with that, they will want him from lunch time so that they can do nothing something with him.
So am I being incredible unreasonable to keep changing the sleepover weekend?
And how should I tell them that they can't have him this weekend either.