Well I found an online DNA tool how good it is is anyone's guess, at the moment I am just fiddling about.

https://dnapainter.com/tools/sharedcmv4

and on the amount of cM it calculates the predicted relationship!

Edit to say I have put in the cM for my closest and known relationships and it was pretty accurate.

https://thednageek.com/the-limits-of...ips-using-dna/