IIRC the other parent is Silver Jubilee. There was an article from the 90s about Twomey introducing kordesii into American roses via Silver Jubilee. There was an entire listing in it. I believe it was an ARS article, but it could have been another publication. If I could recall the month and year, I would, but I was really young.

Available from High Country Roses
https://www.highcountryroses.com/

This is a wonderful rose. I'm surprised that this cultivar is not more widely grown. First, she is an EXTREMELY blackspot-free plant. In Atlanta, she reaches a height of 5-6 feet tall x 3 feet wide. Excellent repeat with a nice, fresh fragrance. Audrey is both rain and heat tolerant too! If you can find her, get her!

Audrey Hepburn is also alive and thriving at Columbus Park of Roses