Latin
Lines 1.97-1.105
Roman Law and Society, Institutes of Justinian 1.97-105
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2. There are also restrictions, though not so extensive, on marriage between collateral relations. A brother and sister are forbidden to marry, whether they are the children of the same father and mother, or of one of the two only. And, if a woman becomes your sister by adoption, you certainly cannot marry; but, if the adoption is destroyed by emancipation, you may marry her; as you may also, if you yourself are emancipated. Hence it follows, that if a man would adopt his son-in-law, he ought first to emancipate his daughter; and if he would adopt his daughter-in-law, he ought previously to emancipate his son.
3. A man may not marry the daughter of a brother, or a sister, nor the granddaughter, although she is in the fourth degree. For when we may not marry the daughter of any person, neither may we marry the granddaughter. But there does not appear to be any impediment to marrying the daughter of a woman whom your father has adopted; for she is no relation to you, either by natural or civil law.
4. The children of two brothers or two sisters, or of a brother and sister, may marry together.
5. So, too, a man may not marry his paternal aunt, even though she be so only by adoption; nor his maternal aunt; because they are regarded in the light of ascendants. For the same reason, no person may marry his great-aunt, either paternal or maternal.
6. There are, too, other marriages from which we must abstain, from regard to the ties created by marriage; for example, a man may not marry his wife's daughter, or his son's wife, for they are both in the place of daughters to him; and this must be understood to mean those who have been our stepdaughters or daughters-in-law; for if a woman is still your daughter-in-law, that is if she is still married to your son, you cannot marry her for another reason, as she cannot be the wife of two persons at once. And if your step-daughter, that is, if her mother is still married to you, you cannot marry her, because a person cannot have two wives at the same time.