"First name of the brother at whose place..."
However, it's likely part of a longer sentence, and the full meaning depends on the context. Here are some possible interpretations:
* "The first name of the brother at whose place (they are staying/living/visiting)"
* "The first name of the brother at whose place (the event took place)"
* "The first name of the brother at whose place (something is located)"
To understand the exact meaning, you need the complete sentence or more context.