Joint Bank Accounts (trust-like alternative)

Question 1

MOST POPULAR ISSUE-

After one of the parties to the account dies, can anyone block the money from going to the survivor of the joint tenancy?

Answer 1

SOMETIMES!
If CCE shows that a survivorship was not intended when the account was established, and that the account was opened only as a matter of convenience to the depositor, then the survivorship language can be set aside.

(hard requirement to satisfy)

Question 2

Who owns what?

Answer 2

each joint account holder owns 1/2 of the joint account, no matter who deposits the money, and if one person makes the entire deposit it is considered a gift of 1/2 to the other account holder