To determine whether it is more likely that two individuals are full vs. half siblings, you can compare the **Combined Sibship Index** ("sibship index") values obtained for the full and half sibling relationships.

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 the likelihood of the full vs. half sibling relationship, the sibship index values can be directly compared. For 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).