That is a great question! I'm not meaning to drip-feed, but our situation is very complex.
I don't think he's capable of finding the right childcare to fit his work needs. And I don't think he's able to support our children on weekdays due to the nature of his work.
He works at a prison which limits his ability to even communicate daily because he's not meant to have his phone on prem. So if school phones him on one of "his weekdays" -- they won't hear from him until around lunchtime or after work. Meanwhile, there might be a sick child that needs attention and then in that case, it falls to me almost automatically. So I might as well take the weekdays.
I am fortunate to have a job/career where I can flex. But also I do recognise where my ex has clearly taken advantage of that.
Also in our local area, childcare is really hard to come by... all slots filled up-- and I personally know, because done the work there for enquiring. I'm willing to take advice there so I can advise him to sort it out so that I can have my children on a weekend.
So would it be reasonable to tell him, "Oh hey, you're taking the kids on Thurs & Fri nights and I get them on Sat & Sun nights." <-- where I know that the resourcing for childcare in our local area is not available, and make it his problem rather than looking after our kids?
I'm happy to take advice on all that, secondary to my initial ask above.
Also, I can't trust my ex with money. About this time last year, our house was at risk because of business decisions that my ex made, without consulting me. And HMRC came knocking on our door. I had to talk them down.
My ex's mum just died. That situation was horrific. I personally feel like he tried to push his mum into a care home or kept her in hospital care so that he could live in her house, after we separated in October.
Between October and December (he finally moved into her house in December), he'd bought a bed to put in the children's playroom and set that up as his office space as well. And we were all miserable through all of that. After he moved out while his mum was still alive, he wanted a quick sale of the family home and that put additional pressure on me. It was only last Friday that I learned from him that he's no longer interested in a quick sale of the family home... and I asked him what changed? He said, its because he has somewhere to live now.
I'm not protecting him. I'm dealing with an abusive person and having to tread lightly.