Number of sibling homicides, 1976-2005
For sisters killed by brothers, the number began at 7 for offenders age 6 and fluctuates with a low of 3 as it increases to 34 for offenders age 14. The number then decreased to a low of 1 for offenders age 60. It then fluctuates with a high of 8 before returning to 1 for offenders age 88. (Data is missing for 68, 84, 86, 89, 90, 91, 92 and 93.)
For sisters killed by sisters, the number began at 2 for offenders age 6 and fluctuates with a low of 1 as it increases to 11 for offenders age 16. Then the number fell to 1 for offenders age 24. After 24, it fluctuates with a high of 8 before returning to 1 for offenders age 93. (Data is missing for 7, 9, 53, 58, 65, 69, 70, 74, 76, 77, 78, 79, 80, 81, 82, 84, 86, 87, 89, 90, 91 and 92.)
For brothers killed by brothers, the number began at 2 for offenders age 6 and climbed to 184 for offenders age 22. The number then fell, reaching 1 for offenders age 74. After 74, it fluctuates with a high of 4 before returning to 1 for offenders age 88. (Data is missing for 7, 81, 83, 84, 85, 87, 89, 90, 91, 92 and 93.)
For brothers killed by sisters, the number began at 2 for offenders age 6 and fluctuates with a low of 1 as it increases to 24 for offenders age 21. After 21, the number decreased to a low of 1 for offenders age 50. It then fluctuates with a high of 3 before returning to 1 for offenders age 76. (Data is missing for 7, 8, 51, 52, 55, 59, 67, 68, 70, 72, 73, 75, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92 and 93.)