If you're attending the same college as your sibling, chances are that you'll be sharing a dorm room or apartment. The benefits cannot be ignored: you already know them and their habits, you've got an automatic study partner and best friend, and you'll always have a carpool buddy if you decide to drive home for the long weekend. But to avoid WWIII, there are some things you should keep in mind when making the transition from home to college.
1. Make a chore chart. Mom and Dad aren't going to be enforcing the rules of your living space anymore. Time to take some responsibility of your own! Divvy up the jobs (fairly) and make sure to pull your weight. Everyone has enough stress in their lives, especially in college, so there's no need to add "Argue About Housekeeping" to the list.
2. Compare schedules. Make sure you're both aware of things like when the other person has class, when they need to be awake in the morning, and how late they'll be out. You can plan your study time around when/if you have space to yourself, what time you get your meals, and even pencil in some roomie bonding time when you're both free. This includes respecting the other person's schedule, too - if you know they have to be awake at 7:00a.m. to get to work, don't blast music until the wee hours of the night. If you make a plan to meet at a certain time, be punctual. Their time is just as valuable as yours.
3. Respect each other's property, feelings, and guests. It's pretty basic stuff, but it's definitely easier said than done.
- Don't assume that just because there was an open door policy at home that the same is applicable for college, too. Knocking is Manners 101. 
- Ask for permission before you borrow things. And if you break or ruin it in some way, replace it. You'd want the same respect applied to your stuff, right?
- If they express that they were hurt by you in some way, apologize. Listen. Talk it out. Even if you didn't mean to upset them, they deserve the respect of having their feelings heard and validated. And if it turns out that you two can't solve the problem on your own or an argument gets out of hand, contact a CA to mediate. Nothing is worse than the uncomfortable tension that comes along with arguing with the person you live with - so try your best to keep an open mind. 
- Talk about your boundaries in regards to guests. If your sibling wants to have a friend over or host a study group, make sure you're not interrupting at inappropriate times or being rude. And if you're the one hosting, be respectful of the noise level and don't let your guests run wild through your living space. Keep the visiting time reasonable, too - especially if your roomie needs to study or wants to host a guest of their own. Communication is key when it comes to this.
Rooming with your sibling will be what you make it. Just remember to respect each other and communicate - they're skills you'll have to use the rest of your life, so who better to learn with than your sibling?
