Grandchildren is already the plural form of grandchild.
Grandchildren is the plural of grandchild.
Grandparents is the plural form of grandparent.
The plural form of grandfather is grandfathers.
The plural possessive is grandsons'.
That would 'grandparents'.
Usage thereof is another story: "Have you met my grandparents?" does not require an apostrophe after it; such as, "That is my grandparents' car"
The plural of granny is grannies.
Grandsons'
Grandchildren
Bridges is the plural form of bridge.
"Beliefs" does not have a plural form, as it is already plural. Beliefs is the plural form of belief.
There is no plural form for the word, countries. This word itself is a plural.
The plural of "she" is "they", so the plural of "she had" is "they had".
The possessive form of the plural noun "grandchildren" is "grandchildren's".
The plural of grandchild is grandchildren.
Since "grandchildren" is already plural, the spelling would have to be the possessive form, which is grandchildren's (e.g. she saved all of her grandchildren's school photos).
Grandchildren
"mokopuna" = "grandchild" plural "grandchildren" = "Nga mokopuna"
Bridges is the plural form of bridge.
"Groceries" is the plural form of "grocery."
There is no plural form for the word, countries. This word itself is a plural.
"Beliefs" does not have a plural form, as it is already plural. Beliefs is the plural form of belief.
The plural form of "meter" is "meters."
It has no plural form.
The plural form for the noun sergeant is sergeants; the plural possessive form is sergeants'.