Rosie poślubiła Jacka Robinsona, ale na początku serii są obcy. Jej panieńskie imię do Rosie Sanderson mała córkę Annę Baron
Hugh: Excuse me, sir, your... the... Deputy Commissioner's daughter has just arrived.
Jack: performing introductions Miss... Miss Phryne Fisher, Miss Rosie...
Rosie: Sanderson will do now, Jack.
Jack: Rosie is my wife. Oo, uh, former... former wife. hangs his head
Rosie: I'm so glad to finally meet you, Miss Fisher.
Rosie: opening the door, then smiling Oh, it's Jack! I thought it was Father. It's that policeman's knock. Just... taking a deep breath and gazing at Jack
Jack: We've come to speak with Mrs Harper.
Rosie: taken aback at seeing Phryne Oh. And, of course, Miss Fisher.
George: I didn't know what Fletcher was up to, Rosie, I swear.
Rosie: How could you not know? Those poor girls!
George: Please. Please try to understand.
Rosie: How could you? sobs How could you!? I can't look at you. cries