Number of victims
Relative Risk
Observed
Expected
Observed/Expected
spouses
65
20
3.32
nonrelatives
11
3
3.33
"offspring"
8
29
0.27
"parents"
9
13
0.69
other "relatives"
5
33
0.15
Risk of homicide in cases where the victim and offender were cohabitants in Detroit in 1972.
Blood
kin
kill each other at much lower rates than nonrelatives.