A recent video posted by songwriter Yazzy Chamberlain on the social media platform had 4.4 million views.
The duo began singing together during lockdown when Mr Tucker’s choir practice was cancelled.
Yazzy Chamberlain said: "In the last couple of years I discovered grandad could sing, which has been lovely to share with him."
John Tucker said singing with his granddaughter made him "feel very young" and he could not believe how well the videos had done.
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