Is follow-up financing possible under these conditions?

In the case of the ex-wife, the money is then at most enough for a condominium. Honestly, I find such an expectation a bit strange, to think that with an absolutely average income, you could finance such an expensive single-family house on your own. Well, with the alimony from the ex, that somehow works out… Great.

Well, the "expectation" was certainly that the marriage would last and the single-family house was obviously financed together. Now the man has backed out and would like to have "his share" paid out in cash. Without knowing the situation, I would be very cautious about making assumptions. The "average income" may also stem from the fact that she naively relied on her husband and instead of a career had to take care of the two children...

I generally find it difficult to give evaluations when you only "know" one side. As someone who is not even listed in the land register, maybe one can approach the matter more objectively? But that's just a guess.

The salary also seems too low to me, but ultimately the woman has to take care of it and talk to the banks. Maybe there are other guarantors, or support from her family?

will Mrs. X also manage to get to the factual level?

At the latest when the first financial refusals come. But from then on, whenever something goes wrong with the money, dirty laundry is usually aired.
It occurs to me: child support doesn’t work like that either. Because the children could also go to the father, then she actually only has the 200€, meaning her income. And with the deduction of living expenses, it no longer works.

I basically find it difficult to give assessments when you only "know" one side. As someone who is not listed in the land register anyway, maybe one can approach the topic more objectively? But that is just a guess as well. It also seems to me that the salary is too low, but ultimately the woman has to take care of it and talk to the banks. Maybe there are other guarantors or support from her family?

I have already witnessed several times in my circle of acquaintances that in a separation one of the two irrationally clings to the property and builds castles in the air. That is annoying for the party who wants to move forward. Capital is tied up, financial obligations continue (possibly even under the aspect that one does not benefit from it oneself) In the present case, the OP is also on the loan agreement, so in case of doubt, he has to pay and does not get his share.

I have witnessed several times within my circle of acquaintances that when a couple breaks up, one of the two irrationally clings to the property and builds castles in the air.

We currently have this in the family.. Really really terrible!

I would therefore strongly recommend Mr. X to sell the house so that both come out of the situation with a bit of money. Perhaps she can buy an apartment with the starting capital and then finance a smaller amount.

In my opinion, children adapt to new situations significantly easier/faster than adults.

There is still a little time - is there a prospect that Ms. X will increase her income by then? That would also be an option. Does she work part-time?

When I read something like this, I am glad that I own and finance my place alone...