Parricide is defined in Article 246 of the Revised Penal Code:
Art. 246. Parricide. — Any person who shall kill his father, mother, or child, whether legitimate or illegitimate, or any of his ascendants, or descendants, or his spouse, shall be guilty of parricide and shall be punished by the penalty of reclusion perpetua to death.
To convict a person with the crime of parricide, the prosecution must prove the following elements:<ref>People vs. Castillo, Jr., G.R. No. 121768, 21 July 1997</ref>
- (1) the death of the deceased;
- (2) that he or she was killed by the accused; and
- (3) that the deceased was a legitimate ascendant or descendant, or the legitimate spouse of the accused.
The key element in parricide is the relationship of the offender with the victim.<ref>People vs. Paycana, Jr., G.R. No. 179035, 16 April 2008</ref> In the case of parricide of a spouse, the best proof of the relationship between the accused and the deceased would be the marriage certificate.<ref>People vs. Paycana, Jr., G.R. No. 179035, 16 April 2008</ref>