On the topic, I recommend the following thread:
https://www.hausbau-forum.de/threads/Haus-auf-Grundstück-der-Eltern-Erbschaftsprobleme.33972/#post-380536
I found this in our records, we only bought the house ourselves a few years ago.. but the existing houses on the property 176 and 202 are missing in this plan..
I recommend the following thread on this topic: https://www.hausbau-forum.de/threads/Haus-auf-Grundstück-der-Eltern-Erbschaftsprobleme.33972/#post-380536
Thank you, I will take my time to read through this.
Maybe.
Is there a development plan?
Is the sketch roughly to scale?
If both answers are "no," please provide a generous excerpt from the property map (tim-online).
Otherwise, show the development plan and enter measurements into the sketch.
Read §5 Building Code NRW. The condition of the access depends on many factors. In my opinion, you will most likely have to sacrifice the existing garage.