Can You Just Add the Averages and Ranges for Double Relationships?

  • If you find yourself investigating whether or not a match is a double cousin of some type, it’s important to determine if there might be fully-identical regions (FIR) shared. If so, AncestryDNA won’t be of much help.
  • For any double cousin relationship, doubling the value for a single cousin relationship or adding together the values for two different levels of relationship is going to create a much wider range than what is actually possible.
  • If any parents in the tree are related to each other, other than the farthest back ancestor pairs or the testers themselves, the shared average and ranges for double cousins are going to be lower than what you would get if you doubled the values or added the values from two different single cousin relationships.

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