Its funny because before even doing duo and this song would come on id sing along to that part saying das kind is nicht mein sohn lol
Hello! Actually it is nominative, as "sein" (werden, bleiben…) takes no direct object, but a predicate. "The kid" and "not my son" are the same person, so in the same case :)
Kid and child are synonymous regarding humans, so yeah. I used kid with all the duolingo questions myself, easier to type than child, less letters. Interesting thing though, a kid is also a young goat I believe.
I wrote "But, the child is not my son" and Duo marked that it had to be kid. Even though child is in the drop down menu and child and kid are synonymous.
Both child and kid are accepted translations for Kind. But this sentence is clearly a reference to the lyric from Billie Jean by Michael Jackson: "But the kid is not my son" so "kid" is probably more preferred