Hier ist das Essen von/vom Robert?

Hello,

Here’s the food of Robert.

This is the genitive (wessen?), therefore actually

Here’s Roberts Essen.

But, The Dativ is his death to the Genitiv!

Here is the food of Robert.

Names

In contrast to normal substantives, in the case of person names such as in English, a previous genitive is usually formed with –s, but also usually the preposition of is used. As a stylistically less good is the reconfigured form.

Example: Personal name

Genitiv: Peter’s house

spoken German: the house of Peter

less good style: the house Peters

(https://deutschegrammatik20.de/attribute/genitiv-namen/)

AstridThePu