Working out buy out options after split

[redskyatnight2023]

Splitting with partner and my mum has offered to help me buy him out of our current property, but I don't think this is possible-tried to do the maths but my brain is melting!
Can anyone help me work out what I would need from my mum to do this based on figures below please:
Property valued at 250k
Equity around 110k
I can get a mortgage of about 67k as I'm currently working PT due to young children.
I think the issue isn't paying him but being able to get the mortgage needed to stay in the property. By my calculation I would need 190k from my mum, 50k for ex and circa 140k cash then what I can borrow to top it up to 250k?

Do you actually need to pay 50% to him? My understanding is it can be different depending on who kids spend most time with etc.

We aren't married so I think I do, we're joint tenants. We have agreed he will have DD just EOW but that's informal at the moment.

Your mum would fund ex £55k for his share of the equity.

You would need to mortgage the £140k remaining on the property. If you can get £67k then your mum would need to give you an additional £73k too, so a total of £128k from your mum.

Ah OK thank you, that's really helpful. I can afford to pay more out a month than I can get on a mortgage so would pay her some at least back. That's better than I thought, I thought I had to come up with the full price of the house as valued.

@redskyatnight2023 OK, I'm unsure if you're unmarried.
When I separated from husband 1, I found a building society who too working tax credits (as they were then) into account for the mortgage. I have no idea if this would help you, but again, it's worth looking into.

Thanks @Seaside3 I'll look into this. Currently not claiming anything at all but I think child maintenance counts for mortgage purposes too?

You will have to check. I suspect you will be entitled to universal credits (i don't claim them now so not sure of thresholds), so I would do a benefit check. I would also find out if you have to give 50% or not.
I'd also get a written agreement with your mum. Agree how you will repay, when she can ask for the money back, check if there are any taxes to pay if its a gift and so on.
I didn't, when my parents helped me. And I really wish I had. The moment I met my current husband they wanted all the money back, plus interest.