This is more involved than I first though, because of the various relationships involved. As far as I can see John McDonnell (the ex-CSM shot), Peter Clancy (the ex-RIC man wounded, and staying with his brother Patrick on the night of the shootings) and Bridget and Patrick Clancy who later claimed to have been willed McDonnells money are all cousins.
This chart is substantially correct, but I would need local knowledge to confirm it. But it does fit with newspaper reports and census information.
(http://www.cairogang.com/police-killed/clifden-mar-17/clancy/family-tree.jpg)
I have been transcribing material I got in British Nat Archives recently, and followers of this thread may like an update.
There were in fact at least 2 military inquiries into McDonnells death and Dublin was not happy with either. The first inquiry found
(http://www.cairogang.com/police-killed/clifden-mar-17/mcdonnell/doubts-snippet.jpg)
1st Inquiry produced this result that J J McDonnell died "of a gunshot wound fired by a person unknown and that the shot was fired with murderous intent"
Dublin told them to do another inquiry as they had not considered all the evidence
2nd Inquiry was not a lot fuller but produced a very diferent conclusion and ended with "in the absence of corroboration of the evidence of Alexander McDonnell (his father ) died of.....gunshot rounds fired by the police in the execution of their duty"
Dublin is still not happy, they want the "rough man" (who was among the police party which raided his house) identified by McDonnell's father to be found.
(http://www.cairogang.com/police-killed/clifden-mar-17/mcdonnell/doubts-snippet2.jpg)
There is nothing else in the file in Kew. Either nothing else happened, or it has been pulled from the files and is still secret, or it is filed somewhere else in Kew
My full write up on McDonnell is on this link (http://www.cairogang.com/police-killed/clifden-mar-17/mcdonnell/mcdonnell.html)