[MODESTINUS libro tertio pandectarum. ] §38.7.5.prInter adgnatos et cognatos hoc interest, quod in adgnatis et cognati continentur, in cognatis non utique et adgnati.
Between agnates and cognates there is this difference, that cognates are also included among agnates, but agnates are not necessarily included among cognates.
uerbi gratia patris frater, id est patruus, et adgnatus est et cognatus, matris autem frater, id est auunculus, cognatus est, adgnatus non est.
For example, a father's brother, that is, a paternal uncle, is both an agnate and a cognate, but a mother's brother, that is, a maternal uncle, is a cognate, and is not an agnate.
§38.7.5.1Quamdiu spes est suum heredem aliquem defuncto existere, tamdiu consanguineis locus non est: puta si defuncti uxor praegnas sit aut defuncti filius apud hostes sit.
As long as there is hope that some self-successor to the deceased will exist, so long is there no room for consanguineous siblings: for example, if the wife of the deceased is pregnant, or if the son of the deceased is in the hands of the enemy.