Who was the brother of Elly Gross?

There is no readily available information about a person named "Elly Gross" and their family, including a brother.

Please provide more context or information about Elly Gross, such as:

* Their full name: Knowing their full name would be helpful in searching for information.

* Their profession or field of work: This could help narrow down potential searches.

* The time period they lived in: Knowing the era might be useful in finding relevant historical records.

With more information, I might be able to help you find details about their brother.