In the first season of Full Metal Panic, Tessa tells Chidori about her brother, who is a Whispered. In the second season (TSR), Chidori comes across Tessa's brother Leonard. When Sagara is talking to Gauron in the second season, Gauron comments that Amalgam has a Whispered in their highest ranks and we see shots of Leonard.
I am wondering, just how much does Tessa know about her brother? Does she know that he is working for Amalgam? And if not, where did she believe he was all this time?