TITLE IX. OF PATERNAL POWER
Our children whom we have begotten in lawful wedlock are in our power.
1 Wedlock or matrimony is the union of male and female, involving the habitual intercourse of daily life.
2 The power which we have over our children is peculiar to Roman citizens, and is found in no other nation.
3 The offspring then of you and your wife is in your power, and so too is that of your son and his wife, that is to say, your grandson and granddaughter, and so on. But the offspring of your daughter is not in your power, but in that of its own father.
TITLE X. OF MARRIAGE
Roman citizens are joined together in lawful wedlock when they are united according to law, the man having reached years of puberty, and the woman being of a marriageable age, whether they be independent or dependent: provided that, in the latter case, they must have the consent of the parents in whose power they respectively are, the necessity of which, and even of its being given before the marriage takes place, is recognised no less by natural reason than by law. Hence the question has arisen, can the daughter or son of a lunatic lawfully contract marriage? and as the doubt still remained with regard to the son, we decided that, like the daughter, the son of a lunatic might marry even without the intervention of his father, according to the mode prescribed by our constitution.
1 It is not every woman that can be taken to wife: for marriage with certain classes of persons is forbidden. Thus, persons related as ascendant and descendant are incapable of lawfully intermarrying; for instance, father and daughter, grandfather and granddaughter, mother and son, grandmother and grandson, and so on ad infinitum; and the union of such persons is called criminal and incestuous. And so absolute is the rule, that persons related as ascendant and descendant merely by adoption are so utterly prohibited from intermarriage that dissolution of the adoption does not dissolve the prohibition: so that an adoptive daughter or granddaughter cannot be taken to wife even after emancipation.
2 Collateral relations also are subject to similar prohibitions, but not so stringent. Brother and sister indeed are prohibited from intermarriage, whether they are both of the same father and mother, or have only one parent in common: but though an adoptive sister cannot, during the subsistence of the adoption, become a man's wife, yet if the adoption is dissolved by her emancipation, or if the man is emancipated, there is no impediment to their intermarriage. Consequently, if a man wished to adopt his son-in-law, he ought first to emancipate his daughter: and if he wished to adopt his daughter-in-law, he ought first to emancipate his son.