Griffiths Valuation for Rathbrack lists 2 Evans households. James Evans had plots 3b & 4 a total of about 27 acres. Nearby on plot 6 was Thomas Evans with 6 acres. There were only 5 or 6 farms in Rathbrack and the 2 Evans, who had adjacent farms, are likely to be related, I would think. It’s still farmland today and easy enough to locate using the maps on the Griffiths website. The 2 farms were very close to Cross Key’s.
According to the 1867 marriage certificate, your William Evans, then living at Rathbrack, father was Thomas, a farmer. I think your William’s farm was plot 6.
Thomas Evans death 1891 aged 65. Informant was his sister Jane.
https://civilrecords.irishgenealogy.ie/churchrecords/images/deaths_returns/deaths_1891/06062/4728208.pdf
Sister Jane and Thomas’s widow Maria in the 1901 census:
http://www.census.nationalarchives.ie/pages/1901/Meath/Crosskeys/Rathbrack/1619112/
Nearby on the other Evans farm was these 2 siblings:
http://www.census.nationalarchives.ie/pages/1901/Meath/Crosskeys/Rathbrack/1619115/
By 1911 there was just the 1 Evans farm:
http://www.census.nationalarchives.ie/pages/1911/Meath/Crosskeys/Rathbrack/727817/
That looks to have been your family. Here’s Margaret Jane’s birth and her parents were William Evans and Sarah Peel. Family were living in what looks like Ballyfore then.
https://civilrecords.irishgenealogy.ie/churchrecords/images/birth_returns/births_1883/02722/2001620.pdf
Thomas’s birth in 1868, also at Ballyfore, was registered by his grandmother Elizabeth. So that tells you Thomas senior was married to Elizabeth. It also tells you that after his marriage in 1867, William had acquired a farm at Ballyfore. He seems to have been back at Rathbrack by 1871 when daughter Elizabeth was born.
https://civilrecords.irishgenealogy.ie/churchrecords/images/birth_returns/births_1871/03295/2207533.pdf
https://civilrecords.irishgenealogy.ie/churchrecords/images/birth_returns/births_1868/03439/2262722.pdf
2 Elizabeth Evans deaths in Rathbrack. Both widows. One in 1876, the other in 1888. Not immediately sure who they were married to. Probably one was to Thomas (father of William who married Sarah Peel) and the other to the James Evans in Griffiths, who may have died in 1864 aged 49.
https://civilrecords.irishgenealogy.ie/churchrecords/images/deaths_returns/deaths_1876/020584/7222405.pdf
https://civilrecords.irishgenealogy.ie/churchrecords/images/deaths_returns/deaths_1888/06185/4768556.pdf
Maria Evans death 1908. Her nephew was the informant:
https://civilrecords.irishgenealogy.ie/churchrecords/images/deaths_returns/deaths_1908/05494/4538941.pdf
Maria’s maiden name was Bower and she married in 1868:
https://civilrecords.irishgenealogy.ie/churchrecords/images/marriage_returns/marriages_1868/11468/8215120.pdf
Her husband Thomas was son of James who I think died in 1864. So they look likely to be the family on plot 3b & 4 in Griffiths.