Buying a house from grandma or waiting for the inheritance?

When I read this, I will probably make sure that when I die there is simply nothing left to inherit. Only a huge mountain of debt, so that the decision to refuse the inheritance is not so hard. Non-material items can be given away beforehand.

When I read this, I will probably make sure that nothing is left to inherit when I die.
Only a huge pile of debt, so that the decision to refuse the inheritance isn’t so difficult.
Intangible items can be given away beforehand.

if you don’t plan to die during your working life, having a lot of debt won’t work out. As a retiree, due to the mortgage credit directive, you won’t even get close to 80% financing, and consumer loans don’t look any better either.

In any case, one house belongs to her and the other to my grandmother + her house has the extension where I live as a tenant.

That may be stated in a usage declaration, but if it is only one parcel of land, she only owns XX% of that parcel with all the houses on it.

Combined with the dispute with the sister, this is really explosive. If the sister blocks it, after the inheritance only a partition auction remains. And then the entire property with both houses is "auctioned." That means your parents will have the amount of XX% of the sale price in their account but no longer have a house.

I really hope the notary recognized this back then and registered any pre-emptive rights in the event of inheritance. Obtain the land register excerpt. Your parents are co-owners and have a legitimate interest. Or look for the purchase contract between grandma and your mother; the details are also stated there. If you have that, you can gladly ask for amateur opinions (not legal advice) in this forum again.

In any case, one house belongs to her and the other to my grandmother + her house has the extension where I rent.

And furthermore, if there are no detailed usage rights in the notarial contract, you actually owe your rent only X% to your grandmother and Y% to your mother. Likewise, your parents would have to pay A% rent to your grandmother and B% rent your grandmother to your parents.

If you have the opportunity, build at least 1km further away o_O .

Grandma knows that after her comes the flood – or at least a brawl, compared to which Cain and Abel would look like a dream team.

I can't quite agree with you this time, because there are laws for that, aren't there? I understood that Grandma and Mother (of S. Meyer) are each listed with 50% in the land register for the entire property. That means to me that after Grandma's death, 50% of the property passes to the three children (one of them is S. Meyer's aunt, one is S. Meyer's uncle, and one is S. Meyer's mother) or is paid out. The brother/uncle of S. Meyer has (verbally or in writing?) assured that he no longer wants a share. If that remains the case, then 50% of the entire property will be divided between S. Meyer's aunt and mother, thus 25% each. If S. Meyer's mother wants to pay out her sister/aunt, the problem might arise that the sister/aunt demands an enormously high price because land prices have risen in the meantime. I do not know which legal provisions apply in such a case and whether a current appraisal must be obtained, but perhaps another esteemed commentator does. :) @S. Meyer: Could you please correct me or did I forget someone?

I can't quite agree with you this time, because there are laws for that, aren't there?

"Or" is correct, because unfortunately there are no laws against people fighting and quarreling over inheritance disputes. Some people even get to know relatives so distant that they hadn’t even exchanged Christmas letters with them before—let alone had them appear in photos from family gatherings.

I understood it as Grandma and Mother [...]

What I understood above all is that the OP unfortunately only suspects, whereas she urgently needs factual knowledge, since one cannot work with assumptions here. Your further conclusions do not basically read as wrong to me, only unfortunately they stand on shaky ground because we are still only speculating at present.