DNA help

[Anniebc44]

Hi I have posted previously, but have updated information and ask for help.
My brick wall has been going on for years, but recently a new match came up and sort of cemented the idea of defo 3 possibly sharing same Grandfather. I think i am down to one of 3 brothers, but now i am completely stuck again. Below are cM results, and if i am correct they would be half first cousins ( my grandfather, born illegitimate, would be their Father's brother). Grandmother known 100% but nothing to do with the Grandfather's family.
Can you browse these results and advise me of what path i should take next?
Much appreciated.
LB 342 cM 5% Definite 1st Cousin of EB and suggesting half first cousins of me
EB 308 cM 4% Definite 1st Cousin of LB and possible Father of HZ
RH 285cM 4%
HZ 207cM 3% Possible child of LB (almost 100% sure of this fact)
RW 133cM

In the B family, according to records, there is the possibility of one of them being my Grandfather.
Thank you A

[Biggles50]

Thanks for the comments in the pm.

I responded to you via message.
.
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I suggested signing up to Pro Tools to see how much cM each DNA match shares with other shared matches.

From this then the relationships within the family tree can be validated.

Do ensure that the generational distances are correct and use DNA Painter to study the %age probabilities of the actual relationships.

Once the possibilities of who the NPE is are identified then each line from them can be followed and approaches made to direct descendants of each of them to take a DNA test.

It worked for me.

[Anniebc44]

Hi. I have the Pro tool and last time was able to have the matches and what relationship they are to me and to each other, but cannot seem to do it since subscribing this month.
The 1st cousin relationship is a definite / confirmed between LB and EB. LB is my closest paternal match.
I am not sure how to use DNA painter. Have tried, but could not figure out what it was telling me.
Thank you so much
A

[Glen in Tinsel Kni]

I have 5 mystery matches who insist match #6 (a male), is their first cousin.  Build the trees using traditional methods and indeed that appears to be correct but #6 has a female profile icon and shares over 1700cM with each and every one of the other five. That's way more than 1c's share by quite a margin. The test was taken by their aunt, the mother of match #6.    I don't know who these people are, they just happen to be my biggest matches but I do know they aren't checking anything and I take what little they choose to divulge with a huge pinch of salt. 

[Glen in Tinsel Kni]

Hi. I have the Pro tool and last time was able to have the matches and what relationship they are to me and to each other, but cannot seem to do it since subscribing this month.
The 1st cousin relationship is a definite / confirmed between LB and EB. LB is my closest paternal match.
I am not sure how to use DNA painter. Have tried, but could not figure out what it was telling me.
Thank you so much
A

DNA Painter has a range of tools including  cM/relationship checker, that's the tool Biggles is referring too

https://dnapainter.com/tools/sharedcmv4

[Biggles50]

Wow Glen.

That 1700 is more like a 1/2 sibling.

That is what I share with my Half Sister.

Annie

Type in Google, DNA Painter Shared Match

Follow the prime result and it should take you to the Tool that I referred to.  Enter the cM value of any DNA match in the box and it then displays the %age probabilities and lists the likely relationships

[Glen in Tinsel Kni]

The real frustration was the four months of WATO trees which gave 20 identical hypotheses that were just twice as likely as the next 40 all for the sake of having the test result attached to the wrong person. I have half sibs so 1700-1800 is a range I'm comfortable working with, it's the 150-200cM matches that give me headaches.

I'd also recommend another tool on dna painter which is the coverage estimator, I've found that really useful for highlighting which lines to prioritise my research on.

[Anniebc44]

Thank you all so much
A

[Steve3180]

For close relatives such as these I would suggest using a more nuanced relationship predictor that takes into account the number of segments as well as size.

https://dna-sci.com/tools/segcm/

This will give you smaller groups of possibilities and distinguish maternal paternal likelyhoods.