| Father | Gruffudd AP NICOLAS FITZURIEN (1393 - 1461) |
| Mother | Mabli verch MAREDUDD DWNN (1399 - 1438) |
| Sibling | Robert NICOLAS (1438 - ) |
| Sibling | Thomas AP GRUFFYDD AP NICOLAS (1415 - 1474) |
| Sibling | Lleucu Verch GRUFFUDD (1419 - 1423) |
| Sibling | Gwenllian Verch GRUFFUDD (1420 - 1421) |
| Sibling | Mabel FERCH GRUFFUD (1421 - 1485) |
| Sibling | Hohn Ap Gruffudd (1421 - ) |
| Sibling | Margred Verch GRUFFUDD (1422 - ) |
| Sibling | Sir Thomas Hunaf Ap GRUFFYDD FITZ URYN (1425 - 1474) |
| Sibling | Owain AP GRUFFUDD AP NICHOLAS (1425 - ) |
| Sibling | Thomas HYNAF AP GRUFFUDD (1425 - ) |
| Sibling | Gwenlian Verch GRUFFUDD (1430 - ) |
| Sibling | Mawd Verch GRUFFUDD (1435 - ) |
| Sibling | Lleucu Verch GRUFFUDD (1436 - 1452) |
| Sibling | Sir Thomas HYNAF AP GRUFFUDD ( - ) |