On the Estate of Hagnias

What then are the rights of the case and how do I define them? If my opponent declares that part of Hagnias's estate belongs to the child by right of kinship, let him bring an action before the archon claiming the half, and, if you decide in his favor, let him take it; for thus the laws ordain. But if he does not claim on these grounds but alleges that I agreed to give the child a share—though I declare that there is not a word of truth in his allegation—let him bring an action, and, if he can prove that I made such an agreement, let him secure the execution of it; for that is only right.