(a) Two individuals are related to each other by affinity if:
(1) they are married to each other; or
(2) the spouse of one of the individuals is related by consanguinity to the other individual.
(b) The ending of a marriage by divorce or the death of a spouse ends relationships by affinity created by that marriage unless a child of that marriage is living, in which case the marriage is considered to continue as long as a child of that marriage lives.
(c) Subsection (b) applies to a member of the board of trustees of or an officer of a school district only until the youngest child of the marriage reaches the age of 21 years.