DD dad taking child he lives with on holiday but not other 2 children

[Flowerbomb1122]

Hi all.
Name changed as could be outing.

I'll try and keep it short. DC dad has 3 children, all different mums. Still with youngest child's mum.

They've booked a weekend away in the UK for all of them in a couple of weeks.

Then - Dads partner has a friend who is getting married somewhere exotic (think 11 hour flight type lovely weather etc) and they are taking youngest DC there on a 2 week holiday.

My DC is the eldest and is struggling to work out why they and middle DC aren't going.
Apparently dad said well you'd be bored at a wedding - to which DC said yeah but that's only one day. Not sure if anything else has been said.

Now to the AIBU - I feel like this is a bit crap for the other two kids. DC is seeing it as they're all going on holiday without them and is understandably miffed.

I'm trying to think what their angle is but I'm struggling.

I haven't spoken to him about it as I know it'll end up in a row (narcissistic bully towards me, I've kept a super close eye on what's said to DC so I trust they'd tell me if something was wrong)

Can any step parents / blended families help me out here? Is it a done thing for the children who don't live there full time to be left out of 'family' breaks? Should the 'family' go away as the 3 of them from time to time? I can't work out what's normal in this kind of set up and what's not.

If it makes any difference DC and I are going on holiday abroad this summer, they are my only child.

But the kids don't know the B&G and vice versa, plus they haven't been invited to the wedding. It's perfectly reasonable for him to go as his wife's plus one, with her child

This...I'm thinking the child is going because their mother is invited. She is friends with the b&g.

He’s a twat to have 3 kids with 3 different mothers but he’s not doing anything wrong.He’s going to his partners friends wedding and they are bringing their child . I don’t know why you are so upset about it . That’s the reality of blended and separated families.

YABU. His partner is entitled to go to her own friend's wedding with her own child, without having to invite two step siblings along.

I am on the other side of this. I have 2 dc and my husband has 2from his previous marriage. I work very very hard and when I go on holiday I want special time with my own dc. I have taken dsc but not every time. All dc need to know that they have time as blended family but there will also be times when they only do things with biological parents