Please note that Mommsen uses the AUC chronology (Ab Urbe Condita), i.e. from the founding of the City of Rome. You can use this reference table to have the B.C. dates
From: The History of Rome, by Theodor Mommsen
Translated with the sanction of the author by William Purdie Dickson
The House-father and His Household
The family formed an unity. It consisted of the free man who upon his father's death had become his own master, and the spouse whom the priests by the ceremony of the sacred salted cake (-confarreatio-) had solemnly wedded to share with him water and fire, with their son and sons' sons and the lawful wives of these, and their unmarried daughters and sons' daughters, along with all goods and substance pertaining to any of its members. The children of daughters on the other hand were excluded, because, if born in wedlock, they belonged to the family of the husband; and if begotten out of wedlock, they had no place in a family at all.
To the Roman citizen a house of his own and the blessing of children appeared the end and essence of life. The death of the individual was not an evil, for it was a matter of necessity; but the extinction of a household or of a clan was injurious to the community itself, which in the earliest times therefore opened up to the childless the means of avoiding such a fatality by their adopting the children of others as their own.
The Roman family from the first contained within it the conditions of a higher culture in the moral adjustment of the mutual relations of its members. Man alone could be head of a family. Woman did not indeed occupy a position inferior to man in the acquiring of property and money; on the contrary the daughter inherited an equal share with her brother, and the mother an equal share with her children.
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Reference address : https://www.ellopos.net/elpenor/rome/1-05-original-constitution-rome.asp?pg=2