Imagine your Mom and Dad are going to live in diferent houses and you have 2 choices:
Chose Mom so it doesent Ground you repeatly, but dont buy many games for PS3,XBOX,or PC.
Chose Dad so it Grounds you repeatly, but let you buy any game in a certain prize.
Evil for Dad is that it gives you a benefit for you, and if you get grounded as some kids say when they are: "Charlie Operation" means that play in secret when grounded.
Good for Mom because it doesent grounds you repetly, but, dont buy many games, or even go to see a game you like. And you are whit her more time outside in usual Mom likes, such as go to buy, etc.