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Ah-ha just found this. Ian and Laura later got back together but their marriage became very troubled, which had a very negative effect on Steven, who became angry with the world. He started writing poison pen letters to people. The identity of who was writing these letters remained a mystery for some time before Steven was found out and many people suspected Laura, as a lot of the letters were aimed at Janine. Laura suspected Janine herself was doing it to frame her and gain sympathy, however, even Ian admitted that he suspected Laura. In a rage, Laura picked up Steven's schoolbag and threw it across the room at Ian and bits of poison pen letters spilled out onto the floor. Ian confronted Steven and, when Steven had gone to his room, Ian shouted to himself that Steven was 'Cindy's little brat!' Steven overheard and Ian told him he was not his natural father. Steven went to stay with his paternal grandmother Pat Evans for a while before deciding to live with Simon, who now lived in New Zealand.
Mmmmm so he was a little stirrer writing letters before he left walford hey.
and moonshadow he probably isnt a child anymore you may find he's now a bloke in his mid 40's :-)