The tests are widely criticised in the New Scientist, both by journalists and those interviewed.

The problem is despite all we now know, we ain't even scratched the surface. And 23andme only give probabilities, environment plays a big part.

First there was Junk DNA, loads of stuff they thought was detritus, historic effluent. Then came epigentics, and one or two experts I spoke to didn't really respond to "when did Junk become epigentics". It is complicated and at a Barn Dance - hardly chit-chat.

Epigentics is the way your history influences your probability for a given condition. And, it has been seen - your off-spring! eg babies born to mothers who experience a lean diet, shortages etc, generally are smaller, and the grandchild is seen to be somewhat smaller. It was a large study and the findings are statistical. This has long been observed with cats, anecdotally. It is evolution protecting the species.
The problem is we, as individuals, prefer to consider the individual cases, and statistcs in a sample of one, are somewhat, a bit teensy unreliable.

Dogs - as soon as I read photo - I got the rest!