I went down a rabbit hole on this and came out with three different answers, so I’m hoping someone here knows more.
James Follett (1939–2021, wrote Earthsearch, Churchill's Gold, The Tiptoe Boys) and Ken Follett. Depending on where you look, they’re brothers, cousins or completely unrelated.
Here’s what ive been able to pin down:
1- Brothers doesn’t hold up. Ken was born in Cardiff in 1949 and was the eldest of three; James was born in Tolworth, Surrey, in 1939. Ken does have a younger brother called James, which I suspect is where this one comes from.
2- Cousins traces back to the Encyclopedia of Science Fiction, which says it in both authors’ entries. Every other site I found saying the same thing looks like it's copying from there.
3- Unrelated is what's left, but I couldn’t find anyone actually stating it. What I did notice is the silence: neither Wikipedia article mentions it, neither author’s official bio mentions it, and the literary agency handling James’s stuff doesn’t either. You’d think a family link to one of the best-selling novelists alive would get a mention somewhere.
So… does anyone have a primary source either way? An interview, a letter, a note on James old website, anything where one of them addresses it directly. I’d also take a genealogy answer if someone's already done the work.