"Tiberius Aemilius Mamercinus, the son of Lucius and grandson of Mamercus" would be written .The more formal the writing, the more generations might be included; a great-grandchild would be or for "pronepos" or "proneptis", a great-great-grandchild or for "abnepos" or "abneptis", and a great-great-great-grandchild "adnepos" or "adneptis".