My Brothers Best Friend

When you've been abroad for a year, coming home to see that your house has been infiltrated can be a bad thing or a good thing. But when the people who infiltrate your house are your brothers best friends, trouble could come right around the corner when you least expect it. Appropriate is when something is suitable or proper in a certain circumstance;

'Sometimes, the one that you'd take a bullet for ends up being the one behind the gun.' < Appropriate.