The possessive form for the singular noun sailor is sailor's (just as you have it in your question).The plural form for sailor is sailors. The plural possessive form is sailors'.Example: All of the sailors' uniforms were inspected at roll call.
The possessive form for the plural noun wives is wives'.
The plural possessive form of the noun "buzz" is "buzzes'".
The plural possessive noun of molecules is molecules' .
The plural possessive noun for "vowel" is "vowels'".
The noun skies is the plural form of the noun sky.The possessive forms are:sky's (singular possessive)skies' (plural possessive)
The plural possessive noun for "sisters" is "sisters'".
The noun "branch" is a regular plural noun, a noun that forms its plural by adding "s" or "es". The plural form of branch is "branches".The plural possessive form is branches', a regular plural possessive.
The plural form for the noun tree is trees.The plural possessive form is trees'.
The plural possessive noun is racers'.
The plural possessive form of "senators" is "senators'."
The plural form for the noun leader is leaders. The plural possessive form is leaders'.