The brother of Benedict XVI, Georg Ratzinger, is very ill.
Benedict XVI left Vatican City and went to Regensburg to be with his brother.
They are very close. I remember many times in Rome seeing them walking together and greeting them. We would talk about sacred music, since George, musician, knew my pastor, Msgr. Schuler. Before everything went sideways for Joseph, they were going to have a house near Velletri, where the Cardinal was Cardinal Bishop.
The brothers are very close, as they were with their sister Maria, who died in 1991.
There is an article in German HERE