What were the names of Marie and Gustave children?

Please provide more context! Who are Marie and Gustave? Are you referring to a specific historical couple, fictional characters, or something else?

For example, you could ask:

* "What were the names of Marie Curie and Pierre Curie's children?"

* "What were the names of the children in the movie 'The Grand Budapest Hotel'?"

Once you provide more information, I can give you the names of their children.