financieras are a great business in DR so clearly unpaid loans get recovered by the means of money payment or overtaking collateral. i know that it's normal that death of a debtor does not erase the debt and prestamistas take what's theirs from the inheritance. the most important part is a presence of a proper legal paperwork regarding the loan.
in any case, the most important issues for you to consider before taking any steps:
do you have proper legal paperwork for that loan?
is the money even recoverable, that is the debtor has cash, properties, land or anything of value?