Answer: In other words, Iris was MOST interested in defining her ancestral kinship in terms of a descent group.
Step-by-step explanation:
What is a descent group?
A descent group refers to family relations that are based on ancestry.
Great great great grandparents refers to ancestry line and if these are from both families which means from her mother's side and her father's side this descent is referred to as a unilineal society. When Iris starts to look to at who married to the family now she is considering or looking at the matrilineal descent.