Hi
Llanbeblig is Caernarvon, 20mls from Portmadoc. David/Catherine wedding entry gives address of David as Gwernddwyryd, Penmorfa (less than a mile from where I live). Baptism record gives father's occupation as Mariner, and residence, Portmadoc. So the Penmorfa one is the correct one.
David's parents are buried at Penmorfa, Jane d. 27/06/1854 age 81, and Owen Roberts, date/ age not given in Monument Inscription (MI) booklet. Also a son Owen d.09/10/1835 age 23.
Family moved to Gwernddwyryd in 1826. Book of family trees 'Achau ....." by T Ceiri Griffith, [152] bottom, follows family back 5 generations. Gives David Roberts jnr's (b 1849 d.1917) ship as the Annie Lloyd.