Send your siblings to the same school, and you could be eligible for a discount, says Clark.
"A lot of times (schools offer) a multistudent discount of 10 percent to 20 percent off of the second round of tuition," he says.
Schools such as Wilson College in Chambersburg, Pa., Carl Albert State College in Poteau, Okla., and Lake Erie College in Painesville, Ohio, offer special scholarships for twins, but other institutions, including George Washington University in Washington, D.C., offer discounts of up to half off for siblings. Contact your school's financial office to find out what's available at your institution.
Attending school at the same time as a sibling can also qualify you for better government aid, though the government won't care whether or not you attend the same school. Since federal need-based aid is determined by how much your family can pay for college relative to the total cost of college, having more than one sibling in school at the same time can significantly increase your need.