The Massachusetts 209C Complaint to Establish Paternity — Sample is a legal document used to establish paternity in Massachusetts. It is typically used in cases where either the mother or the alleged father is challenging the paternity of a child. The complaint outlines the information that needs to be provided to the court, such as the full name and address of the parties involved, the child’s date of birth, and the reasons for filing the complaint. The complaint must also include a signed affidavit from the mother and the alleged father, attesting to the truth of the information provided. There are two types of Massachusetts 209C Complaint to Establish Paternity — Sample: a Voluntary Acknowledgement of Paternity and a Non-Voluntary Acknowledgement of Paternity. In the Voluntary Acknowledgement of Paternity, both the mother and the alleged father must sign the complaint and agree to have the court determine paternity. In the Non-Voluntary Acknowledgement of Paternity, only the mother must sign the complaint and the court will determine paternity without the alleged father’s consent.