[001] To this the demandant may answer that the tenant is not in seisin as heir of the [002] common ancestor but by his gift, or that of another, [to which the answer may be [003] made] that the gift is invalid because he never had seisin during the life of the donor, [004] the donor having died seised thereof as of fee;1 the writ will then stand and the assise [005] will fall, but it will be turned into a jury to inquire into the feoffment and the seisin. [006] Or the answer may be made that he who is in seisin is not a co-heir but a stranger, [007] though he is a legitimate son, because of the limitation of heirs, because the land was [008] given in maritagium to the husband with the mother of the demandant and to their [009] common heirs, and that the tenant, though of the same mother, is [the son] of a second [010] husband and cannot be a co-heir, [nor an heir], near or remote, because of the [011] limitation of heirs.2 But if the answer made is that the tenant is a bastard or a villein [012] and thus cannot be an heir, cosinage there falls, as the assise would fall, because that [013] objection pertains to the right, [because] if he against whom bastardy is objected [014] can prove himself legitimate, or he against whom villeinage is objected prove himself [015] free, by that the matter will be determined, both on the right and on the possession,3 [016] which cannot be done by a writ of cosinage any more than by the assise, [017] which is not so in the cases above.4<If one proves himself legitimate or free in a possessory [018] action, he does not thereby prove himself a nearer heir; that is why recourse must [019] be had to a writ of right since that touches the mere right.>5 He may also say that the [020] ancestor did not die seised as of fee, or if he died so seised that he who claims by writ of [021] cosinage is not in such a degree or line of descent that anything may descend to him, [022] by reason of any nearness of kinship, because [he is descended from] a younger [023] brother of that ancestor. To put it briefly, almost all the exceptions which lie against [024] the assise of mortdancestor lie against the writ of cosinage, since it partakes of the [025] nature of the assise. As in the assise, several persons as well as one may claim by writ [026] of cosinage, and against several just as against one. The assise may be joined with [027] cosinage and [both] determined by a single writ, as where one sister claims on the [028] death and seisin of her father or mother, and a grandson or granddaughter by another [029] sister on the death6 of his grandfather or greatgrandfather or beyond. As where it is [030] said if A. the father (or mother) of B. and grandfather (or grandmother) of C. (or [031] the greatgrandfather or greatgrandmother of C.) whose heirs B. and C. are, [032] was seised in his demesne as of fee etc. (The form of the writ [is] as above, at the [033] beginning.)7 The manner of proceeding by this writ and the exceptions to be made [034] against it may easily be drawn from what has been said. Now we must see whether by [035] the narratio a writ of cosinage may be turned into