This is a bit outing, so I'm going to change some details.
Someone in my family does not know who one of their birth parents is. The only thing that's almost 100% certain is that this parent lived most of their life outside of the UK and that they will be dead now. Accurate name and date of birth are unknown.
The family did do some research about 20 years ago, or maybe even longer, it was pre-internet anyway. It came to nothing because we didn't even have the starting point of a correctly spelled surname.
I've been watching a TV drama where a policewoman traces the sister of an unidentified dead body (literally within minutes but that's TV for you
!) by using a genealogy website. How does this work? can anybody do it? surely someone's DNA would only be on a non-criminal website like this if they had registered it there voluntarily. So it seems a bit unlikely?
Could you trace distant relatives through DNA and then get to work on narrowing the field down? Or does it only work for close (one step away) sort of relatives? If anyone has any experience to share I'd be interested, thanks.