Bryn Morfydd (as the Ordnance Survey currently spells it) lies just south of the village and church of Llanrhaeadr-yng-Nghinmeirch. It is now a small hotel, with a golf course attached.
In Archdeacon D R Thomas's History of the Diocese of St Asaph (HDSA), 2nd (3 vol.) edition, vol. 2, p.108 (within the list of rectors for the parish of Llangynhafal), appears the following:
1857. ROBERTS, Robert Lloyd Anwyl, M.A., Jesus College, Oxford; Rector of Llangwyfan, 1830-57; only son of Rev. Robert Roberts, M.A., Vicar of Llanrhaiadr, 1786-1817.
His successor as Rector of Llangynhafal is shown as having arrived in 1876. Earlier in the section about the same church, on p.106, appears this:
The memorials in the church include the brass lectern to Rector R. Ll. Anwyl Roberts, 1831-76, and Ellen his wife
Also in HDSA vol 2, in the list of vicars for the parish of Llanrhaeadr-yng-Nghinmeirch, p.51, is to be found this:
1786. ROBERTS, Robert, A.M., married Margaret, sister of Owen Holland, Esq,. of Conway, and was the father of Robert Lloyd Anwyl Roberts, Rector of Llangynhafal. -- Mural tablet.
The next incumbent's date of arrival is shown as 1817.
Clergymen quite often employed their newly ordained sons as curates, while the latter were seeking appointment to their first independent benefices; but in this case the father seems to have died too soon to assist his son in that way. However, the new incumbent only stayed for a year or so before taking over a parish in England; and Peter Williams D.D., the man who came in after that, seems not to have resigned his existing living at Llanbedrog when he was appointed to Llanrhaeadr; Archdeacon Thomas says Williams was very busy as a prolific author and that his death, when it came in 1837, occurred at Llanbedrog. That makes it quite likely that he needed a curate to look after the parishioners of Llanrhaeadr, and who better to select than the son of the man who had (effectively) been his predecessor -- someone who had been born and brought up there.
So the theory that Robert junior served as curate before moving on to Llangwyfan in 1830 seems perfectly reasonable, especially as (via Bryn Morfydd) the Roberts family evidently maintained a continuing connection with Llanrhaeadr.
One way to be more certain about the matter would be to check who was certifying the annual Bishop's Transcripts of the parish register, a record series now kept with the diocesan archives at the National Library of Wales.
Rol
CORRECTION (added Friday 5 June):
My post above is misleading about what HDSA shows as the succession of incumbents -- I ought to have turned over another page! Peter Williams did not hold Llanrhaeadr in plurality with Llanbedrog all the way through until his death in 1837 as I had thought: in fact he resigned Llanrhaeadr only two years after his installation there, having persuaded the bishop to appoint his son Edward Williams to the parish as his successor; and the son remained there until 1843. So the odds that Robert Roberts served an apprenticeship as a curate at Llanrhaeadr before moving to Llangwyfan in 1830 seem to to be correspondingly worse. As already mentioned, someone with ready access to the NLW would need to check the certification of the BTs if we are to have some clearer evidence about the possible presence of curates.
