| Father | Gruffydd AP IORWERTH VOEL (1275 - 1313) |
| Mother | Gwenllian FERCH RHIRID FLAIDD (1261 - ) |
| Sibling | Vychan Iorwerth (1302 - ) |
| Sibling | Llywelyn AP GRUFFYDD (1303 - 1340) |
| Sibling | Madog Llwyd AP GRUFFYD (1303 - ) |
| Sibling | Rhys AP GRUFFYDD AP IORWERTH AP MEREDYDD (1305 - ) |
| Sibling | David AP GRUFFYDD (1307 - ) |
| Sibling | Howel Y PEDOLAU AP GRUFFYDD (1307 - ) |
| Sibling | Llewellyn Ddu AP GRUFFYDD AP IORWERTH FOEL (1307 - ) |
| Sibling | Madog Ddu AP GRUFFYDD (1309 - ) |
| Sibling | Ieuan Fychan AP GRUFFUDD (1310 - ) |
| Sibling | Iorwerth Foel AP GRUFFUDD (1311 - ) |