Explain the similar falls between king Lear and Gloucester?

Earl of Gloucester is the parallel character to Lear in the subplot, Gloucester is tricked by his bastard son Edmund into thinking that Edgar wishes to kill him. He trusts Edmund with his secrets until it is revealed that Edmund has betrayed him. He is blinded for being a traitor and helping Lear escape to Dover. Edgar, as poor Tom, leads him to Dover where he is tricked out of committing suicide. He sees Lear in his madness and wishes it upon himself. The news of Edgar's true identity overwhelms him, cracking his heart. Lear too is naive and tricked but by his two daughters.