Figure 2 illustrates the elements of a lineage-linked model.
There are basically two ways that an individual may relate to a family genealogically. An individual
may be a child in various families of orientation (FO or O-family), blood parents, adoptive parents,
etc. This is the individual with siblings and parents in a nuclear family or sibship.
A person may be a parent in families of procreation (FP or P-family). This is the individual with children and
spouses in nuclear families. The family in figure 1 (F1) is the family of procreation for two individuals (I1
and I2) and the family of orientation for two others (I3 and I4).
