There was some movie about two identical twin brothers on a farm.
One kills the other, and stuffs him down an old well.
Later, he has to get his twin’s ring, to impersonate him - so he hauls up the body, and cuts his brother’s ring finger off with a set of pruning shears.
That freaked me out. In fact, I broke my brother’s nose over it.
Errrr...never mind. I never had a twin brother.
I read that book as a teen. I think it was The Other