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 Roman Community
On this Roman household was based the Roman state, as respected both its constituent elements and its form. The community of the Roman people arose out of the junction (in whatever way brought about) of such ancient clanships as the Romilii, Voltinii, Fabii, etc.; the Roman domain comprehended the united lands of those clans.(3) Whoever belonged to one of these clans was a burgess of Rome. Every marriage concluded in the usual forms within this circle was valid as a true Roman marriage, and conferred burgess-rights on the children begotten of it.
3. I. III. Clan-villages
Whoever was begotten in an illegal marriage, or out of marriage, was excluded from the membership of the community. On this account the Roman burgesses assumed the name of the "father's children" (-patricii-), inasmuch as they alone in the eye of the law had a father. The clans with all the families that they contained were incorporated with the state just as they stood. The spheres of the household and the clan continued to subsist within the state; but the position which a man held in these did not affect his relations towards the state. The son was subject to the father within the household, but in political duties and rights he stood on a footing of equality.
The position of the protected dependents was naturally so far changed that the freedmen and clients of every patron received on his account toleration in the community at large; they continued indeed to be immediately dependent on the protection of the family to which they belonged, but the very nature of the case implied that the clients of members of the community could not be wholly excluded from its worship and its festivals, although, of course, they were not capable of the proper rights or liable to the proper duties of burgesses. This remark applies still more to the case of the protected dependents of the community at large. The state thus consisted, like the household, of persons properly belonging to it and of dependents--of "burgesses" and of "inmates" or --metoeci--.
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Reference address : https://www.ellopos.net/elpenor/rome/1-05-original-constitution-rome.asp?pg=9