"Acestea sunt farfuriile bunicilor."

Translation: These are the plates of the grandparents.

[mascha53]

The grandparents' plates is correct. I am American and what I was taught is that the plural possessive requires an apostrophe after the s. The singular possessive has an apostrophe just before the s (the grandmother's plates).

[BrianMarti386944]

Apostrophe comes after s.

[mascha53]

Doesn't bunici mean either grandparents or grandfathers?

[fantomitzah]

Yes, but also grandmothers :))

• o bunică, două bunici = a grandmother, two grandmothers
• un bunic, doi bunici = a grandfather, two grandfathers / a grandparent, two grandparents

[mascha53]

Mersi!

[BrianMarti386944]

I wrote "these are the plates of the grandparents" which is kind of a literal translation, but we would never say it like this in English. Correct: "These are the grandparents' plates." The apostrophe comes after s because it is plural posessive (i.e. belongs to more than one grandparent)