Thank you all so much for your kind and thoughtful posts! I'm sorry to hear that some of you lost a grandparent recently too.
I did talk with my mother yesterday and the funeral is going to be at the end of next week. Next Tuesday my mother is coming to Berlin because of her work and I will be taking the train home together with her on Wednesday. I was able to take some free time, so I can stay at home for a few days after the funeral.