You're ignoring this "real life" fact we keep trying to tell you about. We know (or at least I know) Daffy Duck is NOT a real person, Plucky Duck is NOT a real person, they have NO fathers, mothers, sisters, brothers. So because Plucky Duck is NOT a real person, Plucky (just like every single other cartoon character that says he/she/it does) can't be signed to a contract. However when he implies he can, he implies it that he has signed this contract in the "real life" we keep trying to tell you about. And it is in this "real life" where Plucky is Daffy's REAL father, while the one in the baby Plucky cartoon is just an "actor" (hired in the "real world" where this cartoon character "signed a contract") "playing" his father.