The plural of belief is beliefs.
The plural possessive form is beliefs'.
beliefs
The plural is relatives. The plural possessive is relatives'.
The plural is lads. The plural possessive is lads'.
The possessive form of the noun belief is belief's.
The plural form is Mexicans. The plural possessive is Mexicans'.
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'.
Coaster's is singular possessive. The plural is coasters, the plural possessive is coasters'.
The plural possessive is pals'.
The plural possessive of bandit is bandits'.
Studies' is the plural possessive of study.
The plural of senior is seniors. The plural possessive of seniors is seniors'