No sign in the Deddington PR of any children from this marriage so they may well have moved away from Deddington.

Mary Ann listed as of the Clifton parish with Isaac from Fringford, Oxon, son of Richard, labourer.

Isaac's father was Richard Judd, bap. 23 February 1799 at Hethe, Oxfordshire. His mother was Ann Brown of Water Eaton, Oxfordshire. She was born in 1803. They married at Kidlington, Oxfordshire on 26 March 1821. Richard was a labourer by trade. He was buried at Fringford, Oxfordshire 24 March 1888. His wife Ann was also buried at Fringford, on 3 August 1878.

Isaac's siblings were William b.1821, Mary Ann b.1823, Thomas b.1825, John b.1830, Henry b.1833, Edmund b. 1835, Alfred b.1838, Edwin b.1840 and Owen b.1843, all born at Fringford, Oxfordshire.
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Some of the woodwork in the village church at Fringford was carved by William Judd.
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We see Isaac in 1861, living at Fringford, Oxfordshire with his wife and three children:
Isaac Judd Head Mar 33 Ag Lab Oxon Fringford
Mary A Judd Wife Mar 30 Oxon Clifton
Emma Knibbs Daur 10 Scholar Oxon Clifton
William Judd Son 5 Scholar Oxon Fringford
Sarah Ann Judd Daur 3 Scholar Oxon Fringford
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In 1871, Isac and his family were still living at Fringford, Oxfordshire:
Isaac Judd Head Mar 42 Agricultural Labourer Oxon Fringford
Mary A Judd Wife Mar 40 Oxon Clifton
Sarah A Judd Daur UnM 13 Domestic Servant Oxon Fringford
Ellen Judd Daur 8 Oxon Fringford
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Isaac and his wife Mary can be seen in the 1881 census for England and Wales, living at Fringford, Oxfordshire. There were two of their grandchildren staying with them at the time. Henry was probably staying with them because his mother had a new baby a week before the census date. Not 100% sure why Emma was staying there but we know that her mother Emma died at childbirth. It's possible that Emma went to live with them after her mum died.

Isaac JUDD Head M Male 52 Fringford, Oxford, England Labourer
Mary A. JUDD Wife M Female 50 Clifton, Oxford, England
Emma GEORGE G Dau Female 5 Longton, Stafford, England Scholar
Henry JUDD G Son Male 4 Fringford, Oxford, England Scholar

In 1891, Mary was living at Fringford, Oxfordshire:
Mary A Judd Head Wid 61 Oxon Clifton
Henry Judd Grandson S 14 Plough Boy Oxon Fringford
Frederick Judd Grandson 7 Scholar Oxon Fringford
William Judd Grandson 4 Scholar Oxon Fringford

Presumably, these were the sons of her only son, William Judd.
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Mary can be seen in the 1901 census for England and Wales, aged 70, living at Fringford, Oxfordshire, England. She appears to have two young men living with her - Henry Judd aged 24 and William Judd aged 15. I suspect that these are her grandsons from her son William. Henry, the older grandson, was also seen to be staying with her at the 1881 census.

No sign of Ellen at the 1880 census as Ellen JUDD - I suspect it was too early for her to have married so wonder where she was?