The footballer's sister Faye took her son Lucas for an "emotional' reunion at Doncaster's Moorland Prison yesterday - and later posted a photograph of the visit on social media.
She said that the visit, along with her mum Sonia, was the first time the youngster had seen his uncle, 30, after a 16-month wait.
Miss Johnson tweeted: 'After a long 16 month Lucas finally got to visited [sic] his uncle, so emotional seeing both faces but my little boy can't stop smiling now.'
Her disgraced brother is currently serving a six-year sentence at HMP Moorland for sexual activity with a 15-year-old girl after being jailed in March 2016.
The footballer was briefly moved into solitary confinement for his safety earlier this year after he was recorded bragging about sleeping with a schoolgirl.