Table 1.
Relationships Considered in the Present Study
| Relationship | No. of Distinct Orderingsa |
| Full sibs | 1 |
| Half-sibs (one common parent)b | 1 |
| MZ twins (repeated samples) | 1 |
| Unrelated individuals | 1 |
| Half-sibs (two different parents)b | 3 |
| Two full sibs + half-sib | 3 |
| Two full sibs + unrelated individual | 3 |
| MZ twins + sib | 3 |
| MZ twins + half-sib | 3 |
| MZ twins + unrelated | 3 |
| Two half-sibs + unrelated individual | 3 |
a
For several of the relationships, there are three distinct ways to specify the relationship among three ordered individuals.
b
Shown in figure 1.