List of lists: fields: id, subfields: parents, pgp, mgp.
Pedigree information converted into a CEPH-style list. The top level
list elements are the IDs from id. Below each ID is a list of three
elements: parents (sire, dam), paternal grandparents (pgp: sire, dam),
and maternal grandparents (mgp: sire, dam).
Arguments
id
character vector with unique identifier for an individual
sire
character vector with unique identifier for an
individual's father (NA if unknown).
dam
character vector with unique identifier for an
individual's mother (NA if unknown).
Details
Creates a CEPH-style pedigree for each id, consisting of three generations:
the id, the parents, and the grandparents. Inserts NA for unknown pedigree
members.