The magistrates must execute the father's decision without calling for proofs.[382] A son may thus be arbitrarily confined to the house, fettered and imprisoned by his father, who is only bound to supply him with the necessaries of life. The same rule obtains with regard to other descendants. If in all this great variety of laws we try to discover any one characteristic peculiar to the statutes, we must seek it in the _unitas personæ_ between father and son, which is often carried to a great length. This, too, is a result of the general conception of the family recognised by the statutes. In Urbino and elsewhere the father may be punished for the son, the master for the servant.[383] As to the liabilities of commerce, these are shared, not only by father and son, but by the whole body of the relations, as we find was the case in Genoa, Florence, and many of the principal trading cities. In Florence, the father, grandfather, and great-grandfather incur the same liability for a descendant (even if under guardianship) who engages in trade, as though they stood surety for him. To escape this responsibility they must make a public and formal disclaimer of liability.[384] Thus, if an unemancipated son is agent or factor of a company or house of business, the father is responsible for him, unless he has given the parties legal notice to the contrary. For the same reason the emancipation of the son must be publicly performed and communicated to the Society of Merchants.[385] When a daughter marries, she ceases to be subject to the paternal authority, and can no longer be held in any way responsible for her father, either as regards civil obligations or criminal, should the father have evaded punishment by flight.