To determine whether it is more likely that two individuals are full or half siblings, go to the second page of your DNA results report. Under the table, you will see two indices: **Full Sibling Index** and the **Half Sibling Index. **

If the **Full Sibship Index **is greater than the **Half Sibship Index**, then the individuals are more likely to be full siblings. Likewise, if the **Half Sibship Index **is greater than the **Full Sibship Index**, then the individuals are more likely to be half siblings.

To calculate how many times more likely one type of relationship is compared to the other (full vs. half), take the larger number and divide it by the smaller number.

In this example, if a sibling pair has a **Full Sibship Index** of 100 and a **Half Sibship Index** of 2, then they are **50 times more likely to be full siblings** than half siblings.

Similarly, if a sibling pair has a **Full Sibship Index **of 1.5 and a **Half Sibship Index **of 20, then they are **13.33 times more likely to be half siblings** than full siblings (20 ÷ 1.5 = 13.33).