Looking for an idea for a sustainable decision

For me, such a constellation with care would not be an option. Either I do it voluntarily or not at all.

Apart from that, it would have to be clarified how much you would then have to cover financially if care in a home becomes unavoidable. Don’t forget that care can also mean changing diapers 10 times a day, for example after a stroke. Or having to stay at home constantly because of dementia with a tendency to wander off.

In addition, a renunciation of inheritance would have to be agreed upon with all the other heirs.

Edit: where I unfortunately have no idea at all: to what extent the mother can be obligated not to change the will later, in case you do not receive the property in advance.

First, the mother and all her children must be taught that the other children are de facto disinherited. Such things destroy families. Leave it alone, wait for the regular inheritance, and pay everyone out.

Our plan was actually to first get a sense of how realistic the project is with regard to construction and financing. If the idea fails here, we wouldn’t need to open the big round with the family. But since the topic of inheritance has now been mentioned several times, we will bring the discussions forward and first look at what the general expectations of all parties involved are.

I can already tell you the expectation: money. You pay out accordingly to everyone if you want the [Grundstück].

Simply put, it makes no sense at all to invest in a property that does not belong to you. If you cannot acquire ownership (by whatever means), then I wouldn’t put a single cent into it.