There are no dividends if the business is set up as a partnership. He will eventually end up with an overdrawn current account if he takes more than his share of the profits every year. Easiest way is surely just for everyone to take their share of the profits each year so each partners current account is effectively zero (or an agreed amount to leave cash in the bank account). Then everyone sorts out their own tax bill from their own funds.
I am aware, for tax purposes it is not a divi, call it a disbursement of profits if you like