Because both of his parents came from large families there are quite a lot of us around who are distantly related to Hedd Wyn. His closest living relative is probably his nephew Gerald who has just retired from working the family farm, Yr Ysgwrn. The farm has now been acquired by Snowdonia National Park and is to be developed as a museum and an interpretation centre. See
http://www.bbc.co.uk/news/uk-wales-north-west-wales-20347242