
First of all, you have to know whether you have the legal grounds to file the Petition for Annulment of Marriage or Nullity of your Marriage.
Annulment of voidable Marriage
For Annulment of Voidable Marriages, your grounds could either be any of those mentioned under Article 45 of the Family Code. You can read the full discussion of these grounds in the link below:
Declaration of Nullity of Void Marriages
For the declaration of nullity of marriage, your grounds could either be any of those mentioned under Article 35 (Absence of Formal and Essential Requisites of Marriage) Article 36 (Psychological Incapacity) Article 37 (Incestuous Marriages), and Article 38 (Marriages that are Void by Reason of Public Policy).
The common ground used by Petitioners in filing a Petition to declare their Marriages void is Article 36 of the Family Code or Psychological Incapacity.
You can read the full discussion of the grounds to declare your marriage void in the link below:
Court Procedure
You can read the step-by-step process of the Court Procedure in the link below:

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