Lore: parent (lore)

A character and at least one of their children.

A parent is an individual who has at least one child.

A male (or an intersex equivalent: an andromorph, maleherm) parent is called a father.
A female (or an intersex equivalent: a gynomorph, herm) parent is called a mother.

Generally, the term "parent" is used in the plural to designate an individual's biological parents, and is often used to refer to opposite-sex couples...

However, this tag can totally be used to refer to: a single parent, a same-sex couple or even divorced parents.

For more details...

An "adoptive parent" is - from the point of view of an adopted child - a parent who has adopted them.

A "biological parent" is a parent who owns the same blood as their child.

A "parent-in-law" is the name given to the father or mother of the person's spouse's parents.

Simplified version: W and X made Y.
Y married Z.
Since W and X are Y's biological parents...
From Z's point of view, W and X are their parents-in-law.

A male (or an intersex equivalent: an andromorph, maleherm) parent-in-law is a "father-in-law".
A female (or an intersex equivalent: a gynomorph, herm) parent-in-law is a "mother-in-law".

A "stepparent" is the new spouse (husband or wife) of someone's father or mother.

Simplified version: A and B were married.
A and B made C.
Unfortunately, A and B divorced.
B remarried someone else, B remarried D.
From C's point of view: D is their stepparent.

A male (or an intersex equivalent: an andromorph, maleherm) stepparent is a "stepfather".
A female (or an intersex equivalent: a gynomorph, herm) stepparent is a "stepmother".