[PAULUS libro quinto decimo quaestionum. ] §45.1.130.prQuod dicitur patrem filio utiliter stipulari, quasi sibi ille stipularetur, hoc in his uerum est, quae iuris sunt quaeque adquiri patri possunt: alioquin si factum conferatur in personam filii, inutilis erit stipulatio, ueluti ut tenere ei uel ire agere liceat.
[PAULUS, Questions, book 15.] The saying that a father stipulates effectively for his son, as if the latter were stipulating for himself, is true in those matters which are of law and can be acquired for the father. Otherwise, if an act is referred to the person of the son—for example, that he be allowed to hold, or to go and drive—the stipulation will be useless.
contra autem filius etiam ut ire patri liceat stipulando adquiret ei: immo et quod in suam personam conferre non potest, hoc patri adquirat.
On the other hand, however, a son, by stipulating that his father be allowed to go, will acquire it for him; indeed, even that which he cannot refer to his own person, he acquires for his father.