It is not explicit in the Chicago Manual of Style how to cite Indigenous Knowledge and Elders. The following is based on the Kwantlen Polytechnic University guide on Indigenous Studies and the section on Citing & References.
This requires an in-text citation and an entry in the bibliography list.
Footnote:
1. First Name Last Name of Elder, Nation, Topic/subject of communication if appropriate, Personal communication, Territorial acknowledgment of where the information was shared, Month Date, Year.
Bibliography:
Last Name, First Name of Elder, Nation. Topic/subject of communication if appropriate. Personal communication. Territorial acknowledgment of where the information was shared. Month Date, Year.