In general, 49 percent of would rather find out they have a long-lost sister than a long-lost brother. But among those who would be willing to have all memories from the past year wiped out in exchange for $500,000, 63 percent would rather find out they have a long-lost sister.
Based on a survey of 425 people total and 145 people who would be willing to have all memories from the past year wiped out in exchange for $500,000.