Uncle Charlie and Little Charlie's Mom
Lots of posts question whether or not there's sexual tension between Uncle Charlie and Little Charlie, and whether or not Hitchcock put it in on purpose. I have no doubt he did, and I think it's hinted that Uncle Charlie's extra closeness to relatives didn't start with his niece.
Little Charlie's mother is ecstatic to see her brother (Uncle Charlie) and her elation grows as the film goes on. Then, when Uncle Charlie announces he's leaving, she bursts into tears and wonders how she'll go on after he leaves, and says something about loving her brother so much she forgets she has a husband! I wonder what went on in their childhood...
This isn't in the movie at all, but maybe Little Charlie is so named because her mother wishes Uncle Charlie was Little Charlie's father...or maybe he IS her father! It's far-fetched, but Little Charlie does have that special connection with her uncle (telepathy) and he does state how they have the "same blood flowing through their veins"(yeah, I know he's her uncle, but I wonder if Hitch wanted us to consider these things. I know...I'm extending far past what was actually shown in the film, but...).
Don't get all crazy savaging me...I'm not saying this is supposed to have happened. I think the first thing I said is possibly true, though (the naming and wishing U.C. was L.C.'s father)...the mother DID say those things, with her actual husband sitting right there. The "Uncle Charlie as her father thing", I was just having a little fun."
"How do you feel?"
"Like the Kling-Klang King of the Rim-Ram Room!"