Genealogy is the tracking of descendants of a specific individual through historical records.
Genealogy can be flawed because Family Records can be Lost and Information isn't always going to be accurate (i.e incorrect names/dates).
Ethnography/ParticipantObservation is an anthropological research method that involves observing, recording, and analyzing human behavior within its cultural context.
The goal of Ethnography is to understand how people live their lives by studying them in their natural environment.