An illegal marriage that is void from the start has no legal consequence
A void marriage that was void from the start does not require any legal action to terminate what was never a legally valid marriage. The legal theory is that one cannot terminate what legally never existed in the first place.
Void marriages are based on medical and public policy reasons.
Examples include a marriage between a brother and sister or a marriage between the natural parent to their child.
The risk of severe medical implications is catastrophic, and therefore, states strictly prohibit such unions.