Sponsors at Nicholas's baptism were Thomas McGrath and Johanna Treacy.
It's known Nicholas was related to our Treacys although the exact relationship isn't certain. What is certain is that Thomas Treacy (1881-1969) had a cousin, Nicholas Treacy, and that he was NOT a first cousin. It's also known that Thomas's first cousin, Seán Treacy (1895-1920) had a cousin, Nicholas Treacy (see next paragraph), who is definitely our Nicolas above, but it's not known what type of cousin. It's possible Nicholas was a second cousin of Thomas and Seán, i.e., that Nicholas' grandfather, also Nicholas, and John, the grandfather of Thomas and Seán, were brothers.
In Desmond Ryan's book, "Seán Treacy and the Third Tipperary Brigade IRA" (1945), there's mention of "Seán's cousin, Nicholas Treacy", who was involved in plans to rescue Seán from jail in Dundalk in 1918. Seán and two other IRA prisoners were on hunger strike but called it off when their demands were met. As a result the rescue mission was called off.
According to a family source, Thomas Treacy's cousin, Nicholas (who may be Nicholas above), lived on a small farm next to the Carey farm in Soloheadbeg, Co. Tipperary.