If no record of the solemnization of a marriage heretofore contracted be known to exist, the parties may join in a written declaration of such marriage substantially showing: (a) The names, ages, and residences of the parties. (b) The fact of marriage.
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(c) That no record of such marriage is known to exist. Such declaration must be subscribed by the parties and attested by at least three (3) witnesses. SOURCE: CC § 76.