The plural form of the plural noun sisters is sisters'.
The English language can be very confusing when it comes to pluralization of possessive punctuation. Perhaps these examples will help you:
If you have more than one sister:"My sisters' school is..."
If you have one sister who goes to more than one school: "My sister's schools are..."
If you have more than one sister and they go to different schools: "My sisters' schools are..."
Please note that the difference is the placement of the apostrophe, not the pronunciation.
The plural form of the noun sister is sisters.The plural possessive form is sisters'.example: The sisters' names are Hope and Faith.
The plural of sister is sisters.
The word sisters is the plural form; the plural possessive is sisters'.
The plural form for the noun sister is sisters.
The plural of the noun sister-in-law is sisters-in-law.The plural possessive is sisters-in-law's.Example: "Both of my sisters-in-law's cars were in my driveway."
The plural form for the noun sister is sisters; the plural possessive form is sisters'.Examples:My sisters' school is Lincoln High. Jane is in ninth grade and June is a senior.My sisters' schools are Lincoln High and Washington Community College.
The plural form of sister is sisters.
The plural of sister is sisters.
The plural form of the noun sister is sisters.The plural possessive form is sisters'.example: The sisters' names are Hope and Faith.
The word sisters is the plural form; the plural possessive is sisters'.
The plural form for the noun sister is sisters.
my sisters schools
The plural of the noun sister-in-law is sisters-in-law.The plural possessive is sisters-in-law's.Example: "Both of my sisters-in-law's cars were in my driveway."
step sisters
The plural form is sisters-in-law.The plural possessive is sisters-in-law's.Example: All of my sisters-in-law's children are boys.
The plural form of the singular noun 'school' is schools.
The noun 'sister' is not plural and is not possessive.The plural form is sisters.The possessive form is sister's.The plural possessive form is sisters'.