Mesher Order

Me and my ex have 2 properties, we are both Co-Owners. He moved out, l stayed with our 3 children 16, 13 n 7.He is currently pushing for us to do a financial order, each person removes the other from the house that they are currently staying in.
I am happy with this decision as it makes sure me n my kids have a home. My challenge is that he is pushing to get this done next year when remortage is due. I can't afford it yet and have offered to do it after 3 years when I'm financially stable n can get the mortgage in my name.
He is refusing.... he knows my financial position.
He has lawyers and also told me that he has attended a mediation session, n l have agreed to attend it too.
Im not interested in his money as he has a failing business n has made sure he doesn't look for a job, even though he can get a £100k job with his qualifications, he is a qualified chartered accountant and opened his own audit firm. He is offering us £169 per month for the 3 kids. He claims he can't find a job, so working as a driver instead. His last job was in 2022 and he was on £7k per annum.
I am really interested in keeping the home.... we have stayed in this house for 8 years... I dont want us to loose it.
What are my options here? Is my request unreasonable? Will l be forced to sell if l cant afford to take him off the mortgage? My eldest is starting gcse in Sep, my 2nd has been self harming due to this n my 6 year old has been acting out.
I want to know What happens in mediation and how should l prepare for it....
If it goes to court could the courts force me to sell?
I also dont have money for a lawyer as lm drowning in debts.
Also his lawyer sent me his assets and liabilities, he is in soo much debt l was shocked. He is so petty he may want to try pin it on me. So far he is saying each person keeps their debt.
Sorry its long. Thank you for reading and answering