The place where Michael Holmes lived was a townland (not a street). It was a rural area and in those days there were no house numbers or street names. The townland name was sufficient to identify where you lived. Gorttoose is 253 acres of largely agricultural land.
The number 2 shown in Griffiths in 1911 was the enumerators private numbering system and does not form part of the address.
In Griffiths Valuation for 1857 there were two Holmes farms in Gorttoose, side by side. One (plot 7) was occupied by Thomas Holmes and consisted of a house, offices (outbuildings) and 30 acres. The other (plot 8) was Mary Holmes with a house, offices and 25 acres. (Both being a reasonable sized farms for Ireland at the time. Well above the poverty line).Mary is likely to be a widow. You would probably need to check for wills and in the Registry of Deeds records, in Dublin, to establish exactly who they were.
In 1857 there were 13 households listed in the townland.By the 1911 census, there were 8, plus a police station. There were still 2 Homes farms side by side. One occupied by Michael, and the other by John aged 75. He might be Michael’s brother.
Today the two farms are between the N5 and N2 roads. They are between Culliagh Upper and Culliagh Lower, and just north of the N5. Both should be easy enough to find, should you wish to do so.
Gorttoose is in the RC parish of Strokestown. The parish records start in 1830 so you may be able to pick up relevant baptisms and marriages from that date onwards from that source. This links shows you where copies of the records are held:
The LDS have a copy so you can order that in to your nearest LDS library for a small fee.
Michael Carlos’s marriage to Mary Holmes was registered in Strokestown Jan – Mar 1903 Volume 3, page 263.
Ann Holmes death was registered in Strokestown Apr – Jun 1896 Volume 3, page 203. Estimated year of birth 1826. Her marriage to Michael was probably in the late 1840s and so before the start of civil registration for RC marriages. You would need to rely on the parish registers to find it.
Statutory birth registration only started on 1.1.1864. You don’t say when Catherine Holmes was born but there is a birth registered in Strokestown 1865 Volume 8, page 445, and another in 1866 Volume 13, page 376.You would need to order the certs to find out if either is the right one.