Possessive nouns (but not possessive pronouns) use apostrophes; therefore, "brother's" is possessive. "Brothers" is plural.
The plural possessive of brothers is brothers', e.g. "the brothers' bedroom".
The possessive form of the plural noun brothers is brothers'.Example: The brothers' business is really doing well.
Brother's is singular possessive. Brother is singular and brothers is plural.
The plural form is brothers-in-law.The plural possessive is brothers-in-law's.Example: Both of my brothers-in-law's careers are going very well.
The plural form of the noun brother is brothers.The plural possessive form is brothers'.Example: The brothers' business is really doing well.
The possessive form for the Marx Brothers is the Marx Brothers'.example: The Marx Brothers' nonsense is still popular today..
The possessive form of the plural noun brothers is brothers'.Example: My brothers' names are Jeff and Jack.
The plural form of the compound noun brother-in-law is brothers-in-law.The plural possessive form is brothers-in-law's.example: Both of my brothers-in-laws birthdays are on the same day.
The possessive form for the plural noun brothers-in-law is brothers-in-law's.Example: I had the work done at my brothers-in-law's body shop.
To form the possessive of a plural noun that ends with an s, place the apostrophe after the ending s: brothers'Example: My brothers' names are Jeff and Joe.
Singular possessive: secretary's Plural: secretaries Plural possessive: secretaries'
The correct plural noun phrase is the Marx brothers.When using the surname to refer to two or more family members, the surname is singular, functioning as an attributive noun (a noun used as an adjective to describe another noun, also called a noun adjunct). The noun phrase "Marx brothers" is a plural noun phrase, two or more brothers.The correct plural, possessive form is Marx brothers', indicating that something belongs jointly to the brothers.Example: The Marx brothers' career began in vaudeville.