Marycs,
Regarding the 2 Adams families in Rathkeel in 1901, the one headed by Mary Adams seems to be as follows:
Mary McCracken married Hugh Adams on 4.10.1867 at Buckna Presbyterian (so that’s probably the McCracken family church).
https://civilrecords.irishgenealogy.ie/churchrecords/images/marriage_returns/marriages_1867/11508/8232287.pdf
Their daughter Rachel was born 27.6.1868 which is where I got the couples names. Hugh’s father was Thomas Adams. Thomas appears in Griffiths (the askabout Ireland site) for Rathkeel on plots 9 & 10b. The farmhouse was on 9, 10b was just extra land. The Valuation revision records show the farm passing to Robert in 1879 (suggesting Thomas had died) and then to Hugh in 1889 (suggesting Robert had died or moved away). By 1903 it was reps of Hugh Adams and in 1905 Robert Kernohan took over.
https://www.nidirect.gov.uk/services/searching-valuation-revision-books
Hugh Adams looks to have died in 1901 aged 65. (His death cert isn’t showing on the irishgenealogy site but it’s in the indexes). Thomas Adams died 12.2.1889 aged 72.
Possible marriage for Robert Adams here:
https://civilrecords.irishgenealogy.ie/churchrecords/images/marriage_returns/marriages_1896/10504/5825678.pdf
The Samuel who is a ”nephew” in the 1901 census looks to be daughter Rachel’s illegitimate child:
https://civilrecords.irishgenealogy.ie/churchrecords/images/birth_returns/births_1892/02339/1874787.pdf
The other farm in Rathkeel in 1901 is headed by Ellen Adams born c 1832. Her father was Thomas Adams who died in 1845 aged 62. That’s plot 19 in Griffiths (43 acres). In Griffiths the occupant is Mathew Adams who was Ellen’s brother. He died 1873 aged 45. The farm then passed to Ann Adams who was Ellen’s mother. She died in 1883 aged 81 (so born c 1802) and Ellen was the informant. The property then passed to Ellen.
https://civilrecords.irishgenealogy.ie/churchrecords/images/deaths_returns/deaths_1883/06378/4830467.pdf
1st Broughshane graveyard:
Erected, by, Ellen Adams, of Rokeel, in memory of, her father Thomas Adams died 26th April 1845 aged 62 years also her mother Anne Adams died 10th March 1892 aged 82 years her sister Margaret Adams died 24th April 1854 aged 21 years her brother Matthew Adams died 5th October 1873 aged 45 years Also the above named Ellen Adams who died 19th Oct 1907 aged 75 years 'blessed are the dead which die in the Lord' Rev XIV. 13.
The date of death for Anne Adams on the gravestone does not match that on the death certificate. So presumably the gravestone is wrong. Not uncommon, for inscriptions that were often added years after the death.
Don’t know if the above information on these 2 families helps you place them in your tree. The family seem to have attended 1st Broughshane. It’s baptisms start in 1827 but they are very patchy. The early ones are just a few bits of loose paper. Lots of gaps till they start properly in 1836. The marriages don’t start till 1845, so researching earlier than that is pretty tricky.
Locating the various farms in Rathkeel is pretty straightforward though you need a bit of patience with the maps as they can be hard to read. In general the maps on Griffiths show where the properties were. However in some places those maps were not available when the records were put on-line and that’s the case for Rathkeel and surrounding townlands. However as I say there are copies that do show where the properties are. They can be hard to make out because they have been over-written quite a lot by the Griffiths clerks. However with patience you can see the plot numbers. As I say they are in the local studies section of Ballymena Library. It’s closed at present (Covid) and there’s no immediate prospect of it re-opening. PRONI should also have a copy. It is open by appointment to people who have an existing readers ticket. You might be able to get a researcher to look the maps up for you. (And they can usually get them scanned). The maps themselves are A1 or A0 size and PRONI will scan them. An A0 sheet costs £27.80. A1 is £17.90. Alternatively if a researcher has a camera or hand scanner they may be able to scan the townland for less than that.
Researchers in the PRONI area: http://sgni.net