Gruffydd was the son of Gruffudd ap Iorwerth but his mother is unknown. The date and place of his birth have not been found.
His wife was Annes verch Robert. They were married, but the date and place have not been found. Their two known children were Ieuan ap Gruffydd Voel (?-?) and Dafydd ap Gruffydd Voel (?-?).
| Attribute | Date | Description | Details | Source | Multimedia | Notes |
|---|---|---|---|---|---|---|
| Nobility Title | lord of Castell Odwyn |