SA loan from deceased is the loan now due immediately?

[hoofhearted]

I got some help to purchase a property a number of years ago. A loan was taken out by someone who recently passed away. I serviced the debt and there wasn't any written agreement just pay it off when you can kind of situation. Its now a Blended family situation and the sole beneficiary will receive the entire estate, can I continue to pay this loan to the estate as I have been for the last few years or is the entire loan due now. I fear that the property that is security for the loan will be sold as soon as possible and they will want to be paid.