*Sioned (Jonet) verch Rhiwallon
born about 1037? Powys, Wales

father:
*Rhiwallon ap Cynfyn
born about 1025 Powys, Wales
died 1070 (slain) Battle of Mechain, Montgomeryshire, Wales

mother:
unknown

siblings:
*Gwladys verch Rhiwallon born about 1041 Powys, Wales

spouse:
*Ednyfed ap Llywarch
born about 0990 Denbighshire, Wales

children:
*Rhys "Sais" ap Ednyfed
born Denbighshire, Wales

biographical and/or anecdotal:

notes or source:
LDS
research of S. E. Oman Salt Lake City

I have some doubts if this is the correct father due to the dates.