You make several important points on this topic. To be successful against the bank if the bank cashes the check, what do they have to show? What about against Don?

The legal defenses Javier and Elena might raise are that Tiffany wrote to Don, and these defenses could significantly impact their situation. First, they can argue that the signatures on the checks were forged and unauthorized. Under the law, if someone signs your name without permission, that signature is considered invalid (Understanding Signature Forgery: Types, Prevention, and Legal Solutions, 2023). Since neither Javier nor Elena authorized thase checks, they can assert that they aren't responsible for any payments made to Don. This defense is quite solid and should work in their favor, providing them with peace of mind that they won't be held liable for something they didn't do|