How is it that you are having the slightest difficulty with telling him where to get off?
The ex has just decided to hit the early retirement button (he's 57). I do suspect one of the motivations is to stop paying child support (which he was only paying a fraction of anyway).
Right.
So he has form for not keeping his end of agreements & responsibilities.
Yet feels in a position to dictate this 3 week stay to you, dressing it up as wanting to 'help' with & 'see more' of his own children.
What part of EX is he (& you!) not getting?
Why can he not be more hands-on with his own DC under his own steam, without having you facilitate it for him?
Ex has unilaterally decided that he plans to "camp in his campervan" in January to "help" with the children and to see more of them. I'm not up for this.
He can arrange to see his children off his own bat.
He doesn't need to be camping on your drive/street in order for that to happen.
Do NOT fall for this bullshit.
He is trying to rope you into somehow managing his relationships with his own DC. That is not your job. You have separated. He is no longer your problem, & you mustn't let him use you like this.
Though I would like more help, I will find this irritating I think.
He hasn't helped you since you split.
He won't help you now - he'll just muscle in on your turf, & disrupt the peaceful time you have with your children
He wants to see them - he arranges for it all to happen without your input. You know - like a big boy. A father, even ...
I'm not sure the neighbours will want him there peeing in the bushes in the morning!
Come off it. He plans to be peeing in your bathroom.
I would like to have some kind of shared care agreement, but not this!
This has got fuck-all to do with him offering ANY sort of 'help' to you, & everything to do with appropriating your home, your time, & your helpful, ameliorating presence around the DC.
I suspect he's also testing the water to get his boots back under your bed.
What the fuck can I tell him!
"No. Also - how dare you? I'm not here to make your life easier any more. If you want to see your DC, you come & take them out, or you bring them back to your house. Or entertain them in your campervan, which will NOT be parked by MY house to make YOUR life easier."
Where is your anger OP?
He's manipulating you, & planning to use you.
Tell him to grow the fuck up & parent his own DC without your input.