I guess I’m just confused at this weird belief that if you are a family, everything has to be done with everyone or not at all.
My parents are still together, we didn’t always holiday as a family of 4! They took me to Lanzarote, and took my brother to the Lake District. Then my mum, grandad, aunt, and brother went to America for two weeks, and me and my dad had a couple of trips to museums and musicals in London, because (and I know this will blow your minds) we have different interests and don’t always want to do the same thing!
Similarly, I have been on holiday with just my mum and my DS, my DH and my DS, my DH, DS and two DSDs, and just my DH! We regularly have days out as a 5, but sometimes DH will have a day out with just DSDs so they can have quality time, but equally we will have days out with just me, DH and DS.
It’s not a “blended family” thing, it’s a “everyone is an individual with different interests and needs at any given time, which are constantly changing and need to be nurtured differently” thing.