Do you think Great-Aunt Effie knew? (spoiler inside)
Bertie's great-aunt, Mrs. Saunders, the older lady who came with Isabel to mind the Hutchinson house while they were away in India-- Do you think she knew Hannah was telling the truth at the end when she confessed that she had switched Charlie for Billy? Or was she really convinced Hannah was addled with grief as was suggested?
I tend to think she knew the baby wasn't the real Charlie, but chose to ignore it for the sake of not creating scandal. And because she knew the family would be devastated at losing another child. I got the sense when she was talking to the police inspector that she was helping to cover the truth.
"You can't tell me nothin' if you ain't had an 8-track." -Sinbad