The plural form of the noun child is children.
The plural possessive form is children's.
Examples:
A child's coat hung by the door. (singular)
The children's coats hung in a row. (plural)
The plural possessive form of "child's" is "children's," indicating that something belongs to or is associated with multiple children.
The plural possessive of children is children's, e.g. "the children's lunchboxes".
The possessive form of the plural noun children is children's.
Example use: The children's lunches are ready.
The noun CHILDREN is the plural form of the noun CHILD.
The plural possessive form is children's.
Example: The children's lunch is ready.
Children's is the possessive form.
The plural is relatives. The plural possessive is relatives'.
The plural is lads. The plural possessive is lads'.
The plural form is Mexicans. The plural possessive is Mexicans'.
The plural possessive of stepsister is stepsisters'.
The plural form is inches. The plural possessive is inches'.
The plural form is echoes. The plural possessive is echoes'.
The plural form is suffixes. The plural possessive is suffixes'.
Coaster's is singular possessive. The plural is coasters, the plural possessive is coasters'.
The plural possessive is pals'.
Studies' is the plural possessive of study.
The plural possessive form of "weeks" is "weeks'."
The plural possessive of bandit is bandits'.