Sec. 125.104.  OWNERSHIP INTEREST.  (a)  The parties to a multiple-party account are presumed to own the account in equal undivided interests unless:
(1)  the account agreement provides otherwise;  or
(2)  satisfactory proof of the net contributions to the account exists.
(b)  The net contribution of a party to a multiple-party account is computed by adding:
(1)  the total amount of all of the payments on a share or deposit made by or for the party, less the amount of all of the withdrawals made by or for the party that have not been paid to or applied for the use of another party;
(2)  the pro rata share of interest or dividends included in the current balance of the account;  and
(3)  any life insurance proceeds added to the account because of the death of the party.
Acts 1997, 75th Leg., ch. 1008, Sec. 1, eff. Sept. 1, 1997.