key to the study guide - Name

Common ancestor prospective spouses are related in the direct line. Thus, for example, your
parents are the common ancestors of you and your brother and your
brother's children and their children.
Affinity in direct
line
Affinity in collateral
line
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Affinity in the direct line exists between a spouse and all the blood
relatives in the direct line of the other spouse. In other words, it is the
relationship between you and your spouse's parents, grandparents, greatgrandparents,
children and grandchildren from a previous marriage, and
so on. Affinity in the collateral line exists between a spouse and the blood
relatives in the collateral line of the other spouse. In other words, it is the
relationship between you and your spouse's sisters and brothers and their
children, and so on.
Please study the information in your textbook and the explanations above
very carefully to make sure that you understand what the concepts of
consanguinity, affinity, ascendant, descendant, direct line, collateral
line, common ancestor, etcetera mean.
You may find the diagrams below helpful to understand the different
categories of relationship.
RELATIONSHIP
Consanguinity (blood relationship) Affinity (relationship by marriage)
Direct line (eg
your parents and
your children)
Collateral line
(eg your brothers,
sisters,
nephews, nieces
and cousins)
Your grandparents
Your parents
You
Your children
Your grandchildren
Direct line (eg
your parents-inlaw
or your
spouse's children
from a former
marriage, ie your
stepchildren)
Collateral line
(eg your sisterin-law
and brother-in-law)
Your ascendants
Your descendants