Motorbike under installment payment,its terms and condition in the philippines?

My friend`s father had a motorbike under installment plan for 3 yrs. He had this since january 2008, had paid initial deposit and `been paying monthly dues every month ( jan-april 08 ). Unfortunately he died at the later part of april. Somebody says the obligation to pay his balances terminates when he died and the motorbike should be awarded to his family free of any obligation or whatever. My friend failed to see any relating papers to his father`s doents so she asked the company who in returned said it was untrue, and that the truth is once the " owner died, his co- owner or his family should continue paying up to the last centavo or until the last monthly due. But they failed to show a copy of the company`s term and conditions under the installment category saying they " never kept such " and they`re not even sure if the main office have any ". Anybody with familiar case like this ? My friend had already paid 2 more monthly dues.Which is correct, the somebody or the company?