A Question about German "genitive" (Genitiv).
"The child's father is in Berlin."---"Der Vater des Kindes ist in Berlin."
"The child's mother is in Munich."---"Die Mutter des Kindes ist in München."
"The children's parents are in Leipzig."---"Die Eltern der Kinder sind in Leipzig."
I know the sentences above, and they all use "Genitiv".
But how to explain the sentences below?
"He is my elder sister's son."---"Er ist der Sohn meine ältere Schwester."
"She is my elder brother's daughter."---"Sie ist die Tochter mein älteren Bruder.”
Why here is "Nominativ"?