Harry and Harriett own 1,000 shares of AI Inc. in a brokerage account that is titled Harry

Question:

Harry and Harriett own 1,000 shares of AI Inc. in a brokerage account that is titled "Harry and Harriett, Tenancy-in-Common." Explain how the assets would be handled if Harry passed away. Would this scenario be different if the account was titled "Harry and Harriett, Joint Tenancy with the Right of Survivorship"?