Question about the background story (SPOILER)
So did Sir Charteris really abandon his wife and sell her into slavery or not? His comment to the Commissioner about her money still being in her account (in Manchuria?) strongly suggests no. So what really happened? He mentioned something about the sins of the father -- his father or himself as Poppy's father?
Here's my theory. "Dawson" abandoned Mother Gin Sling but left the money and his daughter. Their "friends" sold her into slavery without his knowledge. He was told that she died and he took his daughter and left the money behind out of guilt. So not as guilty as she assumed but still a cad.