You are so kind!!! I have found Laurence (B:1811 D: 1872) with his wife Alice (B:1811 D:1852) who married in Dublin Dec. 14, 1837 at St. Andrew's in the 1851 census living at 4 Evans Place, occupation coach driver. Thomas (B:1813 D:1881) is shown as a 'visitor', occupation car proprietor living at 4 Keglut (?) St. H.O.107/2177. Thomas marries Elizabeth Magher in 1851 (haven't been able to find documentation of this). The brothers John, Thomas, and Laurance are all car proprietor's/cab drivers and their elder sister Marcella Margaret (B:1808 D:1899?) doesn't show up until 1861 as Marcella Mahoney abode 3 Kirkdale Rd. but haven't been able to find her husband John Mahoney who apparently married in Sept 1848. As far as John Sr. who is the baker, unfortunately I do not know any dates for him, the major entries for him are the notations on marriage banns in Nov. 1840 and August 13, 1854 which have his occupation listed as "baker".
Thank you for your interest and effort.
Cheers,
Renee