If Jay was actually the son of Aladdin and Jasmine, that would mean that Jafar still had the ability to hypnotize people in a sense. So then if Jasmine really did give birth to both Amir (or Emir, i can’t remember)and Jay, that would mean Jafar managed to get on the island, take Jay, and trick people into believing that the baby was lost. But then how would he have gotten on the island? And if his staff was in the museum, does that mean he was genie!jafar, hence beinv able to use magic? And does that mean Jasmine and Aladdin mournes over a child they thought they lost, but actually grew up under Jafar?