Trwy ei brofiadau personol ei hun, fe wnaeth Hefin dynnu mwy o sylw at driniaeth annheg o bobl awtistig yn arbennig, profiad byw a ddenodd nid yn unig gefnogaeth drawsbleidiol ond clust y Llywodraeth hefyd.
Through his own personal experiences, Hefin magnified the often unfair treatment of autistic people in particular, a lived experience that not only drew cross-party support but the ear of Government too.
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