Questions & Answers about Wer hat das Geld des Kindes?
Why is it des Kindes and not just das Kind?
This is the Genitive case, which shows ownership or possession. It is the German equivalent of saying 'of the child' or 'the child's'. For neuter nouns like das Kind, the definite article changes to des, and we must add an ending to the noun itself.
Why does Kindes end in -es instead of just -s?
For masculine and neuter nouns in the Genitive case, you usually add an -s to the end of the word. However, for nouns that are only one syllable long, like Kind, Mann, or Tag, it is much more common and naturally easier to pronounce if you add -es instead.
What case is das Geld in this sentence?
It is in the Accusative case because it is the direct object (the thing being possessed or 'had'). The neuter article das stays exactly the same in both the Nominative and Accusative cases, which is why it looks unchanged here.
Could I use Wem instead of Wer since the question is about possession?
No, because Wer (who) is the subject of the sentence (the person doing the having). The verb haben (to have) always requires a Nominative subject, and Wer is the Nominative form of the question word.