Short answer. No. Under Article 937, a generic legacy releasing debts covers only debts that existed when the will was executed, not ones incurred afterward. If your father lent money after signing the will, that later debt survives and remains collectible from you unless a separate, later act forgives it too.
What the law says
A generic legacy of release or remission of debts comprises those existing at the time of the execution of the will, but not subsequent ones.
Civil Code, Article 937 — Generic Remission of Debts. Read the full provision →
Only debts that already existed are released
Article 937 draws a firm line at the moment the will is signed. It provides that a generic legacy of release or remission of debts comprises those existing at the time of the execution of the will, but not subsequent ones. So when your father's will simply forgives, in general terms, whatever is owed to him, that forgiveness reaches only debts that already existed on the day he signed the will. Anything you or another debtor borrowed from him afterward is a separate, later obligation, and the will's blanket release does not reach it.
Why the law draws the line there
The rule protects the testator's real intent. A general pardon of debts written into a will is meant to wipe out what the testator was owed as of that moment, based on what they knew and had in mind when drafting it. It cannot reasonably be read as a standing, open-ended promise to forgive whatever is borrowed from the estate in the future, including loans made after the will, or debts that did not yet exist and that the testator never contemplated. Treating a general remission as covering unknown future debts would let a will's language outrun what the person actually intended to give away.
What happens to the later debt
Because Article 937 excludes subsequent debts from a generic remission, a loan made after the will's execution stands on its own and remains fully collectible from the debtor in the ordinary way. It becomes part of the deceased's estate like any other credit, to be collected for the benefit of the heirs, unless the testator later takes a separate, specific step to forgive that particular debt as well. Nothing in this article requires a new will; it simply means the blanket clause already written does not automatically stretch to cover a debt that did not exist yet when it was signed. If the testator genuinely wanted the later debt wiped out too, that intent has to be expressed again, in a way the law recognizes, rather than assumed from the earlier, narrower forgiveness.