Emily Mather, Diana's aunt: Meryl Streep (IMDb.com) ----partly wishful thinking because I believe every movie I want to see should have Meryl Streep in it somehow. She is amazing. But, I also think she would be a great Em.
Ysabeau (Matthew's maman): for some reason my brain keeps coming back to Sam Barks who played Éponine the newest film version of Les Mis. She can sing, and she has the youthful looks, petite frame and perfect features for Ysabeau. And I think she can carry off the fierce, protective strength required. Though, she would need dialect coaching and blonde hair, of course. (IMDb.com profile)