This is Thomas Jones in 1891 at Pen Rallt Fawr, Tyn Rhosydd, Llanwnda, Carnarvon, but I can't yet find William Owens. Do you know his age?
https://familysearch.org/ark:/61903/1:1:4PRP-ZW2David
Additional details:-
Thomas Jones Head 47 1844 Slate Quarryman b Llandwrog, Caernarvonshire
Margt Jones Wife 49 1842 b Llandwrog, Caernarvonshire
William T Jones Son 24 1867 Engine Driver b Llanwnda, Caernarvonshire
Robt T Jones Son 21 1870 Quarryman b Llanwnda, Caernarvonshire
Jane Jones Daughter 19 1872 At Home b Llanwnda, Caernarvonshire
Margt Jones Daughter 17 1874 At Home b Llanwnda, Caernarvonshire
Laura Jones Daughter 15 1876 At Home b Llanwnda, Caernarvonshire