2-family house: Border construction adjacent to neighbor's house about 70% more expensive!

The contract states that if we do not get the property or cannot take it, the contract will become void. This was also confirmed to us by a lawyer afterwards. Only which costs we will be stuck with remains to be seen.

The property is currently being divided into 3 parts. If the three do not agree, it will be auctioned.

In principle, the parents-in-law are providing the property. We are taking out a loan for the entire amount. And when repaying the loan, we will be supported by their "rent." This is how the two basically wanted to pay off their part of the loan.

Is this sensible?

Is that sensible

If you are not going to be listed in the land register, then no. Then your parents-in-law own a house and you own the debts. Otherwise, you would have to know that yourself. Who should give serious advice without knowledge of your family and financial situation?

Is it correct if I say that the parents-in-law make a good deal if they exchange land for a house? Do you even want to charge rent there sometimes? Or would it be "ungrateful" to insist on a lease or proper rent? Will the property be transferred to you? Wood is more expensive than stone, yes.

Yes, of course it will be impossible to give good advice.
At the moment, every little piece of advice is worth its weight in gold to me! :)

So the property will belong to them and so will their part of the house.
It is said that it will be transferred to us at some point.

You are right that only the debts will remain with us.

The house belongs to the person who owns the property. I would not get involved in any way, not even as a daughter - I think the parents have not informed themselves enough about how it works in the land register. Clarify this before any of you sign anything. If it turns bad later, the siblings will claim your house because it stands on the inherited land. You get nothing, the daughter more or less as well. What remains are your debts to the bank, but no house.

The house belongs to the one who owns the land.

Oh dear, I didn't know that....
How would it be divided then.
Land and house to the parents.
And the apartment upstairs to us?

I definitely need to read more here in the forum