World War II Budapest

Hi Everyone! I'm having difficulty research wise locating any information about small Theatres and Cabarets in Budapest that operated during World War II. Specifically I am searching for information about a small Theatre (maybe a Cabaret) that was operated by the Rosznay family in Budapest during those years. The only first name I have is for Jula Rosznay, son of the owners, who was killed by the nazi's supposedly. Jula's parents operated the Theatre ~ his father was not Jewish but his mother was. There was one sister who performed in the Theatre.  A family member danced / performed in the Rosnay's Theatre during the WWII years ~ I don't have a connection to the family directly.  I would appreciate any suggestions??

Stacye

Surnames from Budapest ~ Teichner, Grajonca, Rosznay, Nagy