Alexander enjoys telling Siri about his family. This is really the only thing I've ever caught him talking to Siri about—his family. He likes to list his family member's names and tell Siri everything he knows about everyone. I'm not sure why because there are a million things he could try talking to her about but for whatever reason—perhaps because Siri just doesn't get it—he talks about his family.
Here he is talking to Siri about me. "My mom is my mom and my mom's name is Nancy," he's telling her.