Attempting to locate where family resided in this parish

I am a genealogist in the US assisting a client in researching his family in Ireland. The family of seven, mother and father, plus five chidren emigrated from Ireland on the ship the Wave and landed in at Castle Garden, NY on 18 November 1853. Names are Laurence Markey, b. about 1803; Esther "Essy" (Quin or Quinn), b. abt 1813; James, b.abt 1835; Jeremiah, b. about 1837; Patrick, b. abt 1839; Laurence jr., b. Jan. 1840; Mary, b. abt 1845. I have uploaded the ship's manifest.

At the irishgenealogy.ie website, database for baptism, I found the record for Laurence, in the St. Nicholas parish. Citation is page 33 of "DU-RC-BA-768122 st.nicholas_mf_1838-1853_ba_0020". The sponsors were Michael Murphy and Margt Kenny.

I am not sure if  the parish would have been the St.Nicholas of Myra within or without walls, so I will post to both message boards.  I have attached the record the baptismal record.

My question: If possible, I would like to locate baptismal records for the other children, and marriage record for the parents. Also, my client would like to visit the area of his 3rd g-grandfather, Laurence and 3rd g-grandmother Esther (Quin) if this is possible.

Thanks in advance for an advice that you might be able to offer to further my research to help this person,

Jerry Carbone

Whetstone Brook Genealogy

Brattleboro, Vt.