Thank you very much! Yes, Fingon never did quite realize how deeply distressed his cousin was and how desperate he was getting - his depression had blunted his perceptions. As for Morwen, we are told that she never heard any news again from Barahir and his companions after her escape to Brethil, but clearly she knows of Beren's exploits later on in the story. Only, as far as I know, Beren made no attempt to contact her or any of his surviving relatives after he himself escaped from Dorthonion...