I have been with my husband for 6 years now (3 years married). My husband has his son everyday except sundays and Wednesdays.  When I met his son he was 4 years old. He had 'quirks' but I thought it was just because he was young and would grow out of it. When we finally got married, I felt his behavior was still a little off. He talks obsessively about a certain subject, constantly picks his nose, places objects that he finds on the floor in his mouth, cannot stand or sit still to save his life, needs an excessive amount of reminders, doesn't care about how others feel(empathy) etc.