Final answer:
Without specific information about Chimamanda Adichie's family, it is impossible to determine which family member is most interested in family history, ancestral lands, and tradition, although culturally, grandparents often fulfill this role.
Step-by-step explanation:
The question refers to Chimamanda Ngozi Adichie's family and asks for the family member who is most interested in family history, ancestral lands, and tradition. Given the provided information, we do not have a direct answer to this question. However, based on typical familial structures detailed in the information, one might infer that elders, such as grandparents, often hold and pass down such interests in tradition and history. In many cultures, elders possess a strong connection to their ancestry and are the keepers of family stories and traditions. Nonetheless, without specific details about Chimamanda Ngozi Adichie's family related to the options provided, we cannot conclude which family member holds these interests.