In Scene 2, Edmund plots against Edgar and his father for inheritance. He tricks his father into thinking that Edgar was plotting to kill him, then tricks Edgar into thinking that his father was planning to hurt him in a rage. It's easy to deduct that Edmund plans on turning the two against each other and coming out in the end on top.
In Scene 3, Cordelia's evil sisters plot against their father and mock him without his knowledge. Because of this, one can infer that something may happen to King Lear in return for his judgment of Cordelia and his false loving daughters. The daughters plot to drag the king down until they have all the power and title without obligation to their father.