Trying to Find My Family Farm & Cousins

Coming to visit Ireland with my husband & son in mid-November (first trip to Ireland ever four my entire family) - trying to track down ancestral farm and distant cousins - would be a dream come true? Could you help pinpoint where this might be - would be eternally grateful!

"The family farm is located in the section of The Town of Athlone on the west side of The River Shannon - (Connaught side) - County Roscommon. The east section of the Town of Athlone lies in the County Westmeath. The farm is in a section called Bealnamulla. Dernasee is the name of the homestead areas of five families living close to one another - Heavey - Hughes - White - Gavin - Curley. Malachy Heavey (1827/1828) farmed the land with the help of his brother John. Malachy's eldest son Martin (1869-1960) took over running of the farm with his brother John (1873-1963). Martin lived in a newer house near the original and continued to farm the land with his sons Malachy (b. 1915), Tom, Patrick, Martin & Michael (b. 1928). Sons Malachy & Michael built a house in the area in 1968 and still farm the land (with cousins Michael, John & Malachy - sons of John - who still live in the original house with their sister Mary Kate)."