[header] How to get along with roommates in your apartment [title] Respect each other's property. [step] This may sound basic, but there are certain liberties people can take with their own family that they can't with others. While your mother had an open pantry and your siblings didn't mind sharing their clothes, this may not fly in an apartment arrangement. 
Some people are guarded of their possessions, and rightly so. Establish the boundaries early-is it acceptable to borrow clothes, browse through each other's music collection, use somebody else's personal computer, etc.