@4sarah1212
It was kinda simple to do since he's used to his son messing around. When it happens often you tend to notice the signs. Also, it's not like the father hasn't done similar when he was a child.
The father is strict, you can tell noone really wants to get disciplined by him. Doesn't look like he's violent. Just verbally harsh.
Dunno, they're rich, and probably nobles.
Hes the head of the household. The servants can get fired or lose their lives. The wife, son, daughter can be disowned. Kicked out of the house, the money gets poofed. Pretty scary when life is extremely uncertain in their time period.