No. Plural possessive is "their"
Possessive pronouns do not use an apostrophe.
The plural is lads. The plural possessive is lads'.
The plural is relatives. The plural possessive is relatives'.
The plural possessive is weeks'.
The plural possessive is pals'.
No, a possessive noun is formed by adding an -'s (or just an -' to the end of plural nouns already ending in -s) to the existing singular or plural noun; for example:singular=apple, singular possessive=apple's; plural=apples, plural possessive= apples'singular=boy, singular possessive=boy's; plural=boys, plural possessive=boys'singular=car, singular possessive=car's; plural=cars, plural possessive=cars'The nouns that drop the -y and add -ies is to form the plural are nouns ending in -y preceded by a consonant; for example:singular=ally; plural=allies (singular possessive=ally's; plural possessive=allies')singular=baby; plural=babies (singular possessive=baby's; plural possessive=babies')singular=city; plural=cities(singular possessive=city's; plural possessive=cities')
Coaster's is singular possessive. The plural is coasters, the plural possessive is coasters'.
The plural is briefs. The plural possessive is briefs'.
The plural is lads. The plural possessive is lads'.
The plural is trollies. The plural possessive is trollies'.
The plural is relatives. The plural possessive is relatives'.
The plural is stations. The plural possessive is stations'.
Museum is singular. Museum's is singular possessive. Museums is plural. Museums' is plural possessive.
The singular possessive form is heart's; the plural possessive form is hearts'.
The plural form is homes; the plural possessive is homes'.
The plural of rose is roses. The plural possessive is roses'.
The singular possessive is biker's; the plural possessive is bikers'.
The plural form is founders. The plural possessive is founders'.