| Father | Thomas GRIFFITHS FTSC, AC (1871 - 1941) |
| Mother | Mary NICHOLAS (1873 - 1965) |
| Sibling | Herbert Emlyn GRIFFITHS (1896 - 1971) |
| Sibling | William "Willie" GRIFFITHS (1897 - 1985) |
| Sibling | Gwladys Mary GRIFFITHS (1905 - 1997) |
| Sibling | Brinley Thomas "Bryn" GRIFFITHS (1906 - 1997) |
| Sibling | Sydney David "Sid" GRIFFITHS (1908 - 1990) |
| Sibling | Clifford "Cliff" GRIFFITHS (twin) (1911 - 1993) |
| Sibling | Ronald "Ron" GRIFFITHS MBE, RAF (twin) (1911 - 2000) |
| Sibling | Leslie "Les" GRIFFITHS (1913 - 1999) |
| Sibling | Ellis GRIFFITHS (1914 - 2000) |
