Short backstory, I have 3 children with ExH and 1 shared child with ExP, ExP also has a daughter (my SD). ExP has been there since older DCs were toddlers until he walked out 4 days before Christmas (whole other thread)
Since then he has only been interested in DS (his son), ExH treats all 5 children the same but ExP pretends mine don't exist.
He takes his son and daughter out regularly to the park, fishing, family days out - all of which I dismiss to the DCs and point out we don't have to do everything the same but here comes the sticking point... A while ago ExP took DS to the cinema, he burst through the door shouting "I went to the cinema" meanwhile the DCs had been at home while I was at work. I took ExP to one side and said would it have been too much to include them? He has space in his car, I would have happily paid and they would have loved it. He apologised and said he'd think first next time. I took this as he would include them with big days out, just like I always and still do include his daughter (we're talking trips he didn't come on I would get my dad to take a child to free up space for SD). I'm not quibbling the weekly contact, just when there's a big day out they might be included, you know he was their father figure for how many years? He might have a slight affection for them like I wouldn't buy ice creams for my children but not the neighbour who's come round to play.
Fast forward to this weekend, DS bursts in the door "I've been to the beach" cue 3 crestfallen faces! I stepped outside to ask what's going on and he is completely unrepentant "they're nothing to do with me" "they have their own dad" "I'm a good dad" he fails to see their gutted faces and bewilderment. They've only ever known everyone is included, no one is left out. When one gets invited to a party they know their time will come later in the year, they know if one gets a medal at school if they work hard enough they might too. They're not entitled in the slightest so am I being unreasonable to expect him to show an ounce of compassion for them?
Not to drip feed but this is not about me, I don't want to be included in these days out, I don't expect him to pay for anything, just when it's a big day out include all the siblings (bearing in mind DD and SD were best friends throughout school and she still comes around here)