Bit of a back story I get on really well with my DP family, we see them regularly no issues. Also I have no issue with him doing thing's separately with his family.
My question is AIBU to be really quite pissed off and upset at this situation. We go away once a year for a weekend trip, his family and myself and my children, I tried to organise this again this year, me and his SIL met up for a drink and discussed it to which she said they weren't going to come this year because of money and so on.
I then find out that for my DP birthday she has booked for them to go away to the place I was trying to arrange for us. So she's paid for his and his kid's accommodation. Now it transpires that his whole family is going, and I've not even been invited. So my whole plan has been hijacked and I've been cut out of it.