An interesting video about some challenges also DNA sequencing will have to answer.
Genetic Genealogy DTC DNA-Tests overview 2021
Update May 2021 Find relatives (autosomal & X-DNA) Statistically everyone inherits at least a DNA piece from every great-great-grandparent (4th generation, 16 ancestors). Beginning with the 5th generation the genetic ancestors diminish: 8th generation 220/256 ancestors, 16th generation 1018/65536 ancestors (Source). This means usually it is possible to find all 2nd cousins trough widespread autosomal […]