I wonder if this Thomas is worth looking into in 1851
Living at Ty Ycha, Rhiw, Pwllheli which I think is next door to Syntyr on the next page. Although Thomas's surname is listed as Morgan on the transcription it is shown as ditto on the image and he is listed as a tailor

Richard Morgan 62 Shoe Maker & Sexton Rhiw, Caernarvonshire
Margered Morgan 60 Aberdaron, Caernarvonshire
Abraham Morgan Son 26 Shoe Maker Rhiw, Caernarvonshire
Margered Morgan Daughter 14 1837 At Home Rhiw, Caernarvonshire
Thomas Morgan Visitor Unmarried 19 Taylor Rhiw, Caernarvonshire
William Morgan Visitor Unmarried 17 Apprentice Rhiw, Caernarvonshire