SUBJECT: The Concept of ‘Disinheritance’ and Legal Grounds

I. Introduction

This memorandum provides an exhaustive analysis of the concept of disinheritance under Philippine civil law. Disinheritance is a testamentary act by which a compulsory heir, who otherwise cannot be excluded from the succession by the mere will of the testator, is deprived of their legitime for causes expressly stated by law. It is a legal mechanism that operates as an exception to the protection afforded to compulsory heirs. This memo will delineate the legal nature of disinheritance, its distinctions from other concepts, the grounds for its valid execution, the procedural requisites, and its effects on the estate distribution.

II. Legal Nature and Definition

Disinheritance is not a mere disfavor or omission from the will. It is a positive act of exclusion for a specific cause. Under Article 915 of the Civil Code, a compulsory heir may be disinherited for causes expressly established by law. The act is strictly personal to the heir; disinheritance of a parent does not prejudice their children’s right of representation. It is a dispositive act that must be embodied in a testament. Disinheritance cannot be effected through a codicil if the will itself does not contain an institution of heirs, as a codicil is only suppletory to a will.

III. Distinction from Related Concepts

Disinheritance must be distinguished from other forms of exclusion. Preterition is the omission of a compulsory heir from the will, either by not naming them or by not instituting them as an heir without expressly disinheriting them. Preterition of a compulsory heir generally annuls the institution of heirs to the extent of impairing the legitime. Disinheritance, when valid, is a legal cause for exclusion. Exclusion is a broader term, while disinheritance is a specific, cause-driven form of it. Disinheritance also differs from being merely disinherited by operation of law due to unworthiness, which occurs by judicial decree under Article 1032.

IV. Who May Be Disinherited

Only compulsory heirs (legitimate children and descendants, legitimate parents and ascendants, and the surviving spouse) may be subject to disinheritance. Voluntary heirs may be excluded at the testator’s pleasure without need for a legal cause. A compulsory heir can only be deprived of their legitime through disinheritance for a cause specified in the Civil Code or by being declared unworthy.

V. Grounds for Disinheritance

The grounds for disinheritance are exclusive and enumerated in the Civil Code. They are construed strictly. The causes differ depending on the relationship of the heir to the testator.

A. Causes Applicable to All Compulsory Heirs (Article 919):

Conviction for an attempt against the life of the testator, their spouse, descendants, or ascendants.

Accusing the testator of a crime punishable by imprisonment for six years or more, if the accusation is groundless.

Conviction of adultery or concubinage with the spouse of the testator.

Prevention by fraud, violence, or undue influence of the testator from making a will, revoking one, or altering its provisions.

Forgery, falsification, concealment, or alteration of the testator’s last will and testament.

Attempt against the life of the testator’s spouse, descendant, or ascendant, unless under exempting circumstances.

Failure without just cause to give support to the testator when legally obligated to do so.

Maltreatment of the testator by word or deed.

Conviction of a crime with a penalty of civil interdiction.

Leading a dishonorable or disgraceful life (deshonestidad).

B. Additional Causes for Disinheriting Children/Descendants (Article 920):

Conviction for parricide or murder.

Conviction for attempted parricide.

Conviction for rape or acts of lasciviousness against the testator’s spouse.

Conviction of the child for adultery or concubinage with the spouse of the testator.

Conviction for the same flagrant offense by the child and their spouse.

C. Additional Causes for Disinheriting Parents/Ascendants (Article 921):

Conviction for parricide or murder of the testator’s spouse, descendant, or the other parent.

Attempt against the life of the testator’s spouse, descendant, or the other parent, unless under exempting circumstances.

Conviction for rape, acts of lasciviousness, or corruption of the testator’s descendants.

Conviction of adultery or concubinage with the spouse of the testator.

Being a procurer for the testator or their spouse.

Loss of parental authority for reasons specified in the Family Code.

Failure to give support to the testator without just cause.

Conviction of an attempt against the life of the testator’s spouse, descendant, or the other parent.

D. Additional Causes for Disinheriting the Surviving Spouse (Article 922):

Conviction for an attempt against the life of the testator, a common child, or a descendant of the testator.

Conviction for adultery or concubinage.

Physical violence inflicted upon the testator.

Corrupting or inducing a common child to lead a corrupt or immoral life, or attempting to do so.

Being a procurer for the testator.

Final judgment sentencing the spouse to imprisonment for six years or more.

Loss of parental authority under the Family Code.

Unjustified refusal to support the children or the other spouse.

Judicial separation of property between spouses for grounds specified by law.

Abandonment of the testator or children for at least one year.

VI. Procedural Requisites and Formalities

For disinheritance to be valid, strict formalities must be observed. Under Article 916, the disinheritance must be made in a valid will. The cause must be expressly stated. The disinheritance must be certain and not depend on a condition that is not potestative on the part of the disinherited heir. The cause must be true and must exist at the time of the execution of the will. If the cause is a criminal offense, it generally requires a final conviction, except for the cause of “leading a dishonorable or disgraceful life,” which may be proven by preponderance of evidence. A generic statement of the cause is insufficient; the factual basis must be specified.

VII. Comparative Table: Disinheritance vs. Preterition vs. Unworthiness

Aspect	Disinheritance	Preterition	Unworthiness
Legal Basis	Articles 915-922, Civil Code; a positive act in a will.	Article 854, Civil Code; an omission in the will.	Articles 1032-1034, Civil Code; a legal disqualification.
Who is Affected	Only compulsory heirs.	Only compulsory heirs in the direct line.	Any heir, compulsory or voluntary.
Cause Required	Yes, one of the exclusive statutory causes must be expressly stated.	No, it is an omission, intentional or unintentional.	Yes, causes under Article 1032 (e.g., conviction for attempt on testator’s life, forgery of will).
Form	Must be expressly stated in a valid will.	Results from omission in the will.	Declared by the court in a special proceeding.
Effect on the Will	Does not annul the will; the disinherited heir’s share goes to other compulsory heirs.	Generally annuls the institution of heirs to the extent of the omitted heir’s legitime.	The unworthy heir is deemed not to have received the inheritance; property passes as if they predeceased.
Timing of Cause	Cause must exist at the time of the will’s execution.	Not applicable.	Cause must exist at the time of the testator’s death (for most causes).
Remedy for Heir	File an action for annulment of disinheritance if cause is false or not legally sufficient.	Compel recognition of their legitime; the testamentary provisions are annulled pro tanto.	Can file for rehabilitation if pardoned by the testator or after five years for certain offenses.

VIII. Effects of a Valid Disinheritance

The primary effect of a valid disinheritance is the exclusion of the heir from receiving any portion of the legitime. The share that would have pertained to the disinherited heir accrues to the other compulsory heirs. If the disinherited heir is the only compulsory heir, their share goes to the voluntary heirs. The disinherited heir loses all rights to the legitime but is not liable for the testator’s debts beyond any property they may have received by other titles. The disinheritance does not affect the right of representation of the disinherited heir’s own descendants, unless they are also disinherited.

IX. Impugnment and Remedies

A disinheritance can be impugned by the affected heir or their heirs. An action for annulment of disinheritance may be filed on the grounds that: (1) the cause stated is false; (2) the cause is not one of those authorized by law; or (3) the formalities required by law were not complied with. The burden of proving the truth of the cause for disinheritance generally rests upon the heirs who insist on its validity. If the disinheritance is successfully annulled, the heir is reinstated to their full rights as a compulsory heir.

X. Conclusion

Disinheritance under Philippine law is a potent but narrowly construed legal instrument. It permits a testator to exclude a compulsory heir from the legitime, but only for causes exhaustively listed in the Civil Code and with strict adherence to prescribed formalities. It is fundamentally different from preterition and a declaration of unworthiness. Given its grave consequences, the validity of a disinheritance is always subject to judicial scrutiny. Practitioners must ensure that any act of disinheritance is unequivocally expressed in the will, grounded on a true and statutory cause, and executed in full compliance with the law to withstand potential challenges.