Hi John - I don't have definite information to tie this together. I am managing this profile, and putting information into Wikitree, as I get time, from records collected by my aunt. Michael Flavin was born to John and Eleanor Flavin in Eastern County Cork, but I don't have any additional details... They immigrated in ~1843 to Montreal where Eleanor died soon thereafter. Michael's half-brother Timothy Flavin (through John's second wife Mary J O'Connor Flavin) ended up in South Dakota in Springfield, which is one county west of Meade (as you mentioned). These dates and locations are not quite on the mark with your original query... but then again, a lot of my information is from oral history so I'm not sure we can count on 100% accuracy.
I would LOVE to get more details on that and tie my Flavin family to some specific locations and relations in Ireland. (Michael is my namesake so I'm definitely interested in helping with this effort.) I will look through my aunt's records again and see if I can find some additional details.