Porthmadog, Ynyscynhaiarn and Llanfihangel-y-pennant seem to be linked together in census.
Is this a possible
1851 CENSUS YNYSCYNHAIARN, District 5a
Ty Bach, Tremadoc
William Roberts, head, 30
Elinor, Wife, 29
Robert, son, 7
Margaret, daughter, ?
Elinor, 4
Jane, 2