Quote 4
"Carrie gets the pearls, Bess gets the Boston house, Bess gets Windemere…I'll be left alone with nothing, nothing, even though Cady's supposed to be the one. The first, you always said." (69.3)
Penny gets downright pathetic as the book goes on. Her degree of pathetic-ness is directly proportionate to her degree of drunkenness.
Quote 5
"[…] make sure Granddad knows. Tell him it's nothing and tell him it never was anything. Tell him he shouldn't worry about that boy again and then talk to him about Harvard and tennis team and the future you have in front of you." (67.29)
Even if Penny doesn't share Harris's racism, she wants to share his money, and that greed makes her betray her own child.
Quote 6
"Cuddledown is haunted," says Taft. "Can I come and sleep with you at Windemere?" (22.22)
Note that the Sinclair kids don't say my house and your house, instead calling the houses by name. It's kind of like the houses own them instead of the other way around.