Cassiuss mum is revealed to be none other than Elissa Gallow, the woman Aaron went searching for in Paris last year. In Elissas desperate appeal to have Cassius return to Paris with her, his full story is revealed - he was the one who killed Hamish, his father, which makes him Tylers half-brother. Cassius isnt even a real gardener, having talked his way into everyones backyards to search ... (thetvdb.com)