Institutionum libri
Ex libro V
The Same, Institutes, Book V. The Emperors Severus and Antoninus very properly stated in a Rescript that the rights over freedmen are preserved for children, where their father has been convicted of treason; just as such rights are preserved for the children of those who are punished for any other cause.
Marcianus, Institutes, Book V. Where some of several heirs at law, having been prevented by death, or by some other cause fail to accept the estate, their shares will accrue to the others who do accept it; and even though the latter may die before this takes place, the right will still pass to their heirs. The case of an appointed heir is different where his co-heir has been substituted for him, as the estate will pass to the other, by virtue of the substitution, if he is living; but if he should die, it will not descend to his heir.