FTPs can come in two forms:
cis-FTPs: both the parents of one individual are the grandparents of the other individual
trans-FTPs: One of Individual 1's parents is one of Individual 2's grandparents, and one of Individual 2's parents is one of Individual 1's grandparents.
At present, namedRelatives only counts cis-FTPs towards 'FTPs'.
FTPs can come in two forms:
cis-FTPs: both the parents of one individual are the grandparents of the other individual
trans-FTPs: One of Individual 1's parents is one of Individual 2's grandparents, and one of Individual 2's parents is one of Individual 1's grandparents.
At present, namedRelatives only counts cis-FTPs towards 'FTPs'.