Thought broadcasting delusion is a psychotic symptom that makes the patient believe that his thoughts are broadcasted to every one to hear. This means that the patient believes whatever he thinks inside is 'revealed' to everyone, making him vulnerable to everything.
This delusional behavior makes the person paranoid and unable to rely on or believe in anyone. And this paranoia makes him/her believe that their thoughts are perceivable by others. So, Patrick's belief that his inner thoughts are known heard by his in-laws is a symptom of thought broadcasting delusion.
