The strangers is already plural so the possessive form is strangers' adding an apostrophe at the end. However odd it may look it is correct and you do not add another s or 'es to the end.
The plural possessive of "stranger" is "strangers'".
The plural possessive form of "strangers" is "strangers'." For example, "The strangers' cars were parked outside."
The word "strangers'" is plural possessive, indicating something that belongs to multiple strangers.
Singular possessive: secretary's Plural: secretaries Plural possessive: secretaries'
The plural is lads. The plural possessive is lads'.
The plural is relatives. The plural possessive is relatives'.
The plural possessive form of "strangers" is "strangers'." For example, "The strangers' cars were parked outside."
The word "strangers'" is plural possessive, indicating something that belongs to multiple strangers.
Singular possessive: secretary's Plural: secretaries Plural possessive: secretaries'
The plural is lads. The plural possessive is lads'.
The plural is relatives. The plural possessive is relatives'.
The plural form is suffixes. The plural possessive is suffixes'.
The plural possessive of stepsister is stepsisters'.
The plural form is echoes. The plural possessive is echoes'.
The plural form is inches. The plural possessive is inches'.
The plural form is Mexicans. The plural possessive is Mexicans'.
Coaster's is singular possessive. The plural is coasters, the plural possessive is coasters'.
The plural possessive form of "weeks" is "weeks'."