Again, signs point to Longford

Once again I'm looking at DNA matches with links to this border area of County Longford, Ireland and Roscommon. On MyHeritage, my Dad's results match to someone (EM) who is likely a grandson of a first cousin from the O'Brien side, but might be more closely related. This match has 228 cM in common across 10 segments. EM and my Dad also match with PH, who has 23 cM in common with my Dad across 2 segments and has 39 cM in common with EM.

Here's where things get interesting. PH has a tree on MyHeritage and Ancestry. On Ancestry, I can see from shared matches of matches that he and his sister match with my Dad. On Ancestry PH has 17 cM in common, with 99 cM in common with another match (EG) who has 13 cM in common with my Dad. This person also has 32 cM in common with Mike, my Dad's first cousin on the O'Brien side. The sister has 17 cM in common with my Dad, and she does not seem to match Mike. The sister is also a 30 cM match with EG.

I posed this question to Claude, which identified this is likely a set of matches in common with my 3rd-great-grandmother Bridget. I suspected this was the case but because I have so few matches with this line, I'm pursuing a variety of leads. A further wrinkle of connection is PH's 3rd-great-grandparents were Hanleys who immigrated from Roscommon, Ireland to LaSalle County, Illinois and were living in the same township as Bridget in 1850.

I feel like I've looked at these people previously. There's definitely more to follow and further posts soon.