LOTR: Why Didn't Eomer And Eowyn Know Boromir Or Faramir Before The War Of The Ring?

gamerant.com:

The biggest kingdoms in the Lord of the Rings series are Rohan and Gondor. These two people have long been allies, sharing neighboring lands, trade and protection during times of hardship. The famous scene in which the beacons of Gondor are lit, blazing up across the beautiful mountain ranges of Middle Earth all the way to Edoras, where Rohan answers the call for aid, is a breathtaking display of the kinship and loyalty between the two kingdoms, and their willingness to band together in the desperate struggle against Sauron and his ring of power.

The scene with the beacons being lit (although changed slightly n the movie adaptations) also highlights another key point between the two kingdoms, which is that the two leaders of these realms are familiar with each other, and have definitely been involved in political events and negotiations with other people in the past. Gandalf even advises Denethor “you still have friends, you are not alone in this fight. Send word to Theoden of Rohan.” Unfortunately at this point, Denethor is beyond reason, and has already been corrupted by the loss of his son and the influence of the Palantir, but then the beacon is lit, Rohan rides to the defense of the white city nonetheless.

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However, what is most intriguing to fans is that, if the two monarchs of the kingdoms know one another, why don’t their various children? It seems strange that there are never any interactions between Eomer and Eowyn of Rohan, and Boromir and Faramir of Gondor, until right at the very end of the third film. Considering that they grew up in kingdoms so close together, that their parental figures knew each other well, and that the main passage