Yes I went through exactly this with my exp. He has his children EOW. That’s all Fri- mon with the odd midweek stuff thrown in. So absolutely next to day to day responsibility for them. Aside from two weekends a month.
I had my children a lot more than that - am the primary carer in the main home and although my kids are with my exh 3 nights a week, they are still at mine a lot (after school etc). So the food, the noise, the organisation was on me. Now mine are teens it is of course a lot easier.
It also happened that two of the EOW contact nights were my childfree nights. Those are the days/ nights I could make plans/ see my friends/ relax etc.
Despite all of this, the unrelenting pressure from my exp to spend time with his DC was immense. I used to get a feeling of dread in the pit of my stomach everytime I knew a contact weekend was coming up. As I knew I would have to either say no (and face the displeasure) or compromise and see them.
In the end I put my foot down and ended up having a clear chat. I suppose in hindsight it was a bit of an ultimatum. What I said was the following
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His time with his children was precious and actually he was better focussing on 121 time with them vs diluting it with another person whom ultimately the children didn’t want to see (me).
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My own children wanted 121, chill downtime with me and his children cut into that. They also weren’t chill. Their coming absolutely changed the dynamic of my home for my DC.
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he wasn’t factoring my needs into the situation anywhere. And whilst he had 11 childfree nights a fortnight, I had 6. What he was proposing would have taken my childfree nights down to 2. His remained the same (as like your partner he was quite happy to go off and do his own thing at his with no responsibility re my children).
So what I suggested was a compromise / routine. That allowed me 121 time with my DC. Him 121 time with his DC. I would spend a fixed window with them but then do my own thing the rest of the time.
He didn’t react well and I initially got the ‘you don’t like my kids, you’re jealous, you don’t understand family’ (all emotionally emotive to try and get me to do what he wanted). I held firm and said ‘no, I’m exhausted. This is all I am capable of taking on. And this actually is better for your children’ (and it was).
He settled with what I offered as the alternative was that we broke up. Because I simply wasn’t prepared to parent his children For him, on top of carrying my own load.
Ultimately he wasn’t happy with the set up. And that his behaviour against me became increasingly toxic. He took my stance as a rejection of his children, him and ultimately his need of wanting to show ‘family’ to the world.
That’s my exp. That’s not necessarily what your partner will do. He may handle it a lot better.
My advice is to figure out what you are prepared to do. And table it, over a conversation. Don’t make it about the noise, the kids (hell get defensive). Simply say you’re exhausted. That you and your DC need some 121 time. And you need a compromise/ routine so that everyone is clear when they are seeing one another but that you also get your downtime.
He may not like it (he doesn’t sound like he will). I personally could not fathom why my exp wasn’t delighted to spend 121 time with his own kids. I guard my time with my DC as I live it when it’s just me and them. We have the best time together and create lovely memories.
You’re not in the wrong here, he is, massively. Personally i think some of these men want to show the world they’re fathers of the year. But the day to day of actual parenting is something they find tedious, boring and they don’t actually get any enjoyment from it (not that they’d ever admit that). That’s why the pressure for someone else to be there is constant. It relieves the tedium/ boredom of parenting for him. You and your needs simply don’t factor.