[IDEM libro primo sententiarum. ] §3.5.36.prLitis contestatae tempore quaeri solet, an pupillus, cuius sine tutoris auctoritate negotia gesta sunt, locupletior sit ex ea re factus, cuius patitur actionem.
[THE SAME, Opinions, Book I] At the time of joinder of issue (litis contestatio), it is customary to inquire whether a ward, whose affairs have been managed without the authority of his guardian, has been made richer by that transaction, the action on which he is facing.
§3.5.36.1Si pecuniae quis negotium gerat, usuras quoque praestare cogitur et periculum eorum nominum, quae ipse contraxit: nisi fortuitis casibus debitores ita suas fortunas amiserunt, ut tempore litis ex ea actione contestatae soluendo non essent.
If anyone manages an affair involving money, he is compelled to pay interest also, and to bear the risk of those debts which he himself contracted; unless by fortuitous events the debtors have so lost their fortunes that, at the time of the joinder of issue in that action, they were not solvent.
§3.5.36.2Pater si emancipati filii res a se donatas administrauit, filio actione negotiorum gestorum tenebitur.
If a father has administered the property of an emancipated son which was donated by himself, he will be liable to the son by the action for the management of affairs.