Yes, this is a tricky one to track so as to be able to establish the facts for certain.
I have looked at the 1861 census for a William Owen(s) at Wyddfyd where Miriam said she was living in the marriage certificate. This shows that Wyddfyd Farm has a family headed by John Williams living there. He is a farmer of 40 acres born Llandudno. There is then Penymynydd Ucha which has Richard Davies at the head. He is a Farmer of 27 acres and born Llandudno. The next one is Penymnydd Isa which has William Owen head of the family. He is a farmer of 30 acres born Llandudno. The household comprises:
William Owen, head, married, age 53, Farmer of 30 acres born Llandudno
Elizabeth Owen, wife, age 57, born Llandudno.
Mary A Owen, daughter, age 15, born Llandudno
Elizabeth Owen, daughter, age 13, born Llandudno
Jane Owen, age 9, daughter, born Llandudno
Margaret Owen, age 6, daughter, born Llandudno
Elizabeth Williams, age 19, servant. born Eglwys Rhos
Evan Jones, age 18, Carter, born Eglwys Rhos.
In the 1851 census the family is shown as Owens and they are living in Penymynydd. It seesm to be the same family as it is as follows:
William Owens, head, married, age 42, Farmer born Llandudno
Elizabeth Owens, wife, age 41, born Llandudno
Mary Owens, daughter, age 5, born Llandudno
Elizabeth Owens, daughter, age 3, born Llandudno
David Williams servant age 26, ag lab, born Llangwstenin
Catherine Jones, servant, age 24, born Denbigh Llandrillo
Susanna Davies visitor, age 70, born Denbigh Llandrillo
In this census the residence before this is the Telegraph Station. The one after it is the vicarage.
Hugo, I wonder if you would be able to identify this place as what we now know as Pink Farm. Do you have any idea when they started doing teas etc? William would be of an age to be Miriam's father but the name is Owen, not Owens.
I seem to think Miriam was born c1831 so it will be more difficult to prove anything for her. I cannot find a baptism but in the census returns she shows she was born in a number of different places.