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I searched on the subscription site Roots Ireland and found the marriage record in 1843. I located Patrick's baptismal record in 1853 (see below) and baptismal record transcriptions for five siblings Peter 1844 Bridget 1846 John 1850 Michael 1857 Thomas 1860. The 1855 Griffiths Valuation head of household listing shows three Coleman/Colman McDonagh records https://www.failteromhat.com/griffiths/galway/kilcummin.htm Likely your ancestors came from one of those three townlands.
Date of Marriage:24-Sep-1843
Parish / District:KILCUMMIN OUGHTERARD
Name:Patrick McDonoghDate of Birth:
Date of Baptism:11-Apr-1853Address:
Parish/District:KILCUMMIN OUGHTERARDGender:MaleCountyCo. Galway
Father:Colman McDonoghMother:Bridget HolleronOccupation:
Sponsor 1 /
Informant 1:Mary JoyceSponsor 2 /
Informant 2:Not Recorded Not Recorded