The Massachusetts Affidavit Disclosing Care Or Custody Proceeding Involving A Child is a signed statement used in family law proceedings. It informs the court of any prior or ongoing child custody or care proceedings involving the same child or children. It is also used to determine the best interests of the child or children, and to ensure that the rights of all parties involved are protected. There are two types of Massachusetts Affidavit Disclosing Care Or Custody Proceeding Involving A Child: the Affidavit of Disclosure and the Supplementary Affidavit of Disclosure. The Affidavit of Disclosure is used by a party in a family law action to provide information about any prior or ongoing proceedings involving a child or children. The Supplementary Affidavit of Disclosure is used by a party in a family law action to provide additional information that was not included in the original Affidavit of Disclosure. Both Affidavits must be signed and witnessed by a notary public.