Dostoevsky connection? (spoilers)

I'm watching the movie on TCM, and while it seems dated in its social premises, the acting is good and Bette Davis is fascinating. The resistance of her brother to her marrying Job strikes me as very similar to the subplot in Dostoevsky's "Crime and Punishment". Rodion, the hero/villain of the book, has had to give up his university studies due to his poverty and is sinking into the pit, mentally and socially, and that's one reason his thoughts of killing the pawnbroker woman mature into action.
Now, Rodion has a sister, Dunya, who is very close to him, and early in the novel he gets a letter from his mom informing him that his sibling is to marry a rich self-made man of St. Petersburg. Rodion guesses that she is doing this to be able to help him get some money and make a career, and from his mother's talk in the letter he divines that Mr Luzhin is a conceited, self-possessed gentleman, who will end up trying to put Dunya under his feet, and that his proud sister could only come up with this plan out of a desperate wish to help her brother. Which he resents, so he decides to show Luzhin some cold steel, mentally, and break the proposed marriage if needed.

When Mr Luzhin turns up in his dreary lodgings, the half-dazed and irate Rodya goes for the kill and roundly insults his brother-in-law to be. He, in turn, wants an excuse and if he won't get it, he'll treat him as an alien. A reunion is set up between the two men, Dunya and the mother. Luzhin is confident, but too confident, and he ends up displaying his conceit and his "philosophical" belief that a wife should be on her knees to her husband - preciisely what Rodion suspected. He leaves the stage angry and bruised, and the betrothal is ended.

This sounds very much like Fanny and Trippy, doesn't it? Fanny will marry a gentleman who is decades older - he could be her father - and while he loves her, he's stiff and patronizing and clearly not right for her. Her brother senses the gulf between them and does all he can to challenge his sister's suitor and make him halt his advances on her. It's very possible that Elizabeth von Arnim, who wrote the book, nicked some ideas from the great Russian.