In A2 we also met an tuiseal ginideach iolra (the genitive or possessive plural) with ainmearan cinnteach (definite nouns).
The first rule to remember here is that definite genitive (possessive) plurals do not lenite!
And the second thing to remember here is that we use the plural definite article nan or nam to show the genitive case.
seòmar nam balach
the room of the boys, the boys’ room
taigh nam bràithrean
the brothers’ house
biadh nan cat
the food of the cats, the cats’ food
bàla nan con
the ball of the dogs, the dogs’ ball
tidsear nan cùrsaichean
the teacher of (the) courses
Comhairle nan Eilean Siar
(the) Western Isles Council
dorsan nan taighean
the doors of the houses
àm nam Fuadaichean
the time of the (Highland) Clearances
Radio nan Gàidheal
(the) Radio of the Gaels
Comhairle nan Leabhraichean
The (Gaelic) Books Council
faclan nan òran
the words of the songs
Comann nam Pàrant
the Parents’ Council
A plural noun following nan or nam can sometimes translate into English as an indefinite. The phrase àireamh nan oileanach (above) translates in English not as ‘number of the students’ but as ‘the number of students’.