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Do you have his marriage certificate? It should give the name and occupation of his father. You can buy it from the GRO
https://www.gro.gov.uk/gro/content/certificates/login.aspand the ref is Thomas Hobson sept qtr 1916 Aberayron vol 11b pg 58
The marriage was to Mary A Jones and the mother's maiden name on the birth reg of Mary Hopson in 1926 is Jones.
There is a possible 1891 for a Thomas Hobson of around the right age
Caravan, Llanybri Road, Llanstephan, Carms RG12/4516 folio 131 pg 15
Thomas Hobson head 36 basket maker b. Salop, Shrewsbury
Sarah wife 37 b. Salop, Oswestry
Mary Ann dau 11 b. Oswestry
Elizabeth dau 10 b. Montgomeryshire, Bettws
Susannah dau 7 b. Radnor, Rhyader
Thomas son 5 b. Carms, Llangennech
Richard son 4 b. Carms, Llanycrwys
Jane dau 2 b. Carms, Llanfiangel
John son 1 b. Carms, Nantgaredy