One of my parents has a serious mental illness. It first manifested and became obvious (requiring multiple hospitalizations over the years) in their late 20's a

One of my parents has a serious mental illness. It first manifested and became obvious (requiring multiple hospitalizations over the years) in their late 20's after I was born. I don't have the data in front of me, but I understand a mid-to-late 20's onset and diagnosis of mental illness is not rare -- plenty of time to have kids beforehand.