Passage 9.7.3
τῶν δέ οἱ παίδων Φίλιππον μὲν τὸν πρεσβύτατον, ὡς μετʼ οὐ πολὺ παρέλαβε τὴν ἀρχήν, ἀπήγαγεν ὑπολαβοῦσα νόσος φθινώδης, Ἀντίπατρος δὲ ὁ μετʼ ἐκεῖνον Θεσσαλονίκην τὴν μητέρα ἀποκτίννυσι, Φιλίππου τε οὖσαν τοῦ Ἀμύντου καὶ Νικασιπόλιδος· ἀπέκτεινε δὲ Ἀλεξάνδρῳ νέμειν πλέον εὐνοίας αἰτιασάμενος. ὁ δὲ Ἀλέξανδρος ἦν νεώτατος τῶν Κασσάνδρου παίδων· ἐπαγαγόμενος δὲ Δημήτριον τὸν Ἀντιγόνου καθεῖλε μὲν διʼ ἐκείνου καὶ ἐτιμωρήσατο τὸν ἀδελφὸν Ἀντίπατρον, ἀνεφάνη μέντοι φονέα ἐξευρηκὼς ἑαυτῷ καὶ οὐ σύμμαχον.
Of his sons, Philip, the eldest, having shortly after succeeded to power, was carried off by a consuming disease. Antipater, who followed him, murdered his mother, Thessalonice—who was daughter of Philip son of Amyntas and Nicasipolis—accusing her of showing greater favor toward Alexander. Alexander was the youngest of Cassander's sons; after inviting Demetrius, the son of Antigonus, through his assistance he both overthrew and avenged himself upon his brother Antipater, but in doing so, he discovered that he had gained for himself a murderer rather than an ally.