Durkins in Balla - land question

Hello! My great-grandfather (Thomas Francis Durkin) was born in 1882 in Balla to Charles Durkin and Margaret McDonnell. He went to the US in 1900, passsage paid for by an uncle, whose name I unfortunately don't have. He lived in St. Louis, Missouri.

I recently received the most lovely information from the County Mayo Family History Centre, but had a question concerning land location. I would love to visit Balla and see where his family's land was and visit the area. I have information from the Griffith's Valuation for Charles' father, Neal Durcan. His land was located in the townland of Drumadoon, plot 3. I was able to find a map corresponding to this information, so I'm aware of that location.

However, I'm uncertain if land was typically passed down to a son, even in the case of being a tenant. Would the land that Neal Durcan had be passed down to Charles after his death in 1870? Did the lease typically remain with a family? Or would Charles have had land elsewhere? Charles also lived in Drumadoon (I have found him in the 1901 and 1911 census for that area). I'm just not sure where Charles' farm was. Is there a map corresponding to the census records that might be able to help? Or is it more likely that he took over the land at his father's death? The information I recevied from the Mayo Family History Centre listed Charles as the only son of Neal Durcan and Cecelia Jordan (Charles was born 1833, died March 30, 1916). He had 3 sisters, Anne (baptised 29 April, 1838), Celia (baptised 30 August 1840), and Winifred (baptised March 1843). I wasn't sure if perhaps there were other sons not listed. I don't know who the daughters married or what might have happened to them. 

Any help would be most wonderful! Thank you!