>A second-degree relative is defined as a blood relative which includes the individual’s grandparents, grandchildren, aunts, uncles, nephews, nieces or half-siblings
You absolutely do not know the medical history of all those people to know if they have a history of schizophrenia, psychotic disorders, or bipolar disorder. People tend to not talk about their mental illness and these disorders can be well managed with medication. I have 17 aunts and uncles half of which I only see every 3-4 years and one I've never met. Do you think I know what their diagnosises are? Apparently one of my uncles had a really bad heart condition since birth but I didn't even know he did until it killed him in his 60s.
Plus if you just keep adding relatives you'll eventually get one with one of those conditions. You're more asking about family size at that point.
You absolutely do not know the medical history of all those people to know if they have a history of schizophrenia, psychotic disorders, or bipolar disorder. People tend to not talk about their mental illness and these disorders can be well managed with medication. I have 17 aunts and uncles half of which I only see every 3-4 years and one I've never met. Do you think I know what their diagnosises are? Apparently one of my uncles had a really bad heart condition since birth but I didn't even know he did until it killed him in his 60s.
Plus if you just keep adding relatives you'll eventually get one with one of those conditions. You're more asking about family size at that point.