Need help for chapter 4

Something is clearly bothering their father, and he finally tells them that Marcus, one of his colleagues, had a difficult day at work. Andrew Prior is a political leader - all of the city's political leaders come from Abnegation. Jeanine Matthews, the sole Erudite representative on the council, wrote a report attacking Marcus's character. She claimed that Marcus was violent towards his son, which caused the boy to switch from Abnegation to Dauntless. It is very rare for anyone to switch out of Abnegation, so Marcus's son is well remembered.