The most interesting and obvious scenario, you named yourself:
"real" house price about 550-600,000 + renovation another 50-100,000€ is currently hardly feasible for us or only at the absolute limit.
But since the income is uncertain in the next months/years (possibly a new job --> salary? parental leave? etc.) we are looking for an alternative possibility.
You are looking for an alternative, but only you benefit, everyone else is a puppet.
Apart from the fact that you want to move into an "unrenovated house"? (or do you want to invest money there),
what if you want or have to move somewhere else because of the job? What does dad do with the then vacant parental house without rental income? And where do you get your further capital from? Does he have to move again because of you?
What would you say if a sibling wanted to do it like that? Make a deal with dad: dad moves into a one-room apartment, sibling moves into the parental house with the family. Deals between both parties run. They live in the house for over 10 years, which reduces its value. Dad dies and leaves a house he was still able to pay off from the rental income of the sibling. There is then an inheritance community of 3 siblings, of which one sibling still lives in the house. The house is practically unsellable due to the rental and you watch your inheritance fade away over the 10 years from the start.
Another scenario: what if you, as a tenant of your parental house, get kicked out by your wife? Separation?! She stays there with the children, you pay the rent.... your dad can’t sleep anymore... after all, the apartment he lives in is on the sales list, but he can’t move back into his house because it is inhabited by mother and children.
In that case, father could buy the apartment from us and in return we take over the house.
It’s not like everything is bought, sold, moved within a week for free, especially not if there are other equal parties involved. It always has to be notarized again and again. Possibly wills even have to be changed. These are always contributions in the four-digit range for each position.
What you simply don’t consider is that it is legally not so easy to make deals behind the backs of other family members when a lot of money is involved.
If each of you three thought like that, you would be selling dad :oops:
What you also don’t consider: you definitely have to pay off this one apartment loan!