Royal revelation as gardener traces his roots
The former Gardeners' World presenter met his future wife Sarah at Cambridge University in 1979. They eloped to North Yorkshire while she was married to another man, who rowed in the same boat as Don.
The discovery that Don, 55, is related to Sarah's former husband is one of two revelations that are not actually shown in next Monday's programme.
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Hide AdThe other finding is a royal connection – that Sir Alexander Erskine of Gogar, the guardian of James I, who had been King of Scotland for 36 years when he became King of England, was one of Don's ancestors.
He said: "Another really interesting thing that doesn't get shown is that I'm directly related to my wife's first husband.
"I didn't discover that until I made the programme. That's quite extraordinary."
He has been married to Sarah for 27 years their three children are now grown up.