Griffith Valuation of 1854 has 5 Brady's in Athboy Parish, 4 are named Edward and 1 Michael. There are 2 McCann's both named Patrick but this can also be 1 person with several properties as follows:(I go by how many houses)
Athboy is a Town, a Parish and a townland in the Union of Trim*:
Patrick McCann Parish of Athboy, Townland 88 Acres, tenant of the Earl of Darnley
#5a Margaret Macan house, outbuilding and land 2.0.0
(not known if connected but women rarely had leases
in their own names, likely a widow who took over lease
after a death of husband
#12 Patrick McCann land 7 acres 8 roods 35 perches
#19 Patrick McCann house, outbuildings and garden
Upper Bridge St. Town of Athboy 0.1.30
1841 UK Census is showing 6 Edward Brady's 1 of which is age 30 Orange St. Taskey Court Liverpool
Edward Brady, Parish of Athboy, Townland Castle Town, Windy Harbour, tenant of Govenors of St. Stephens Hospital
#3 land 24 acres 2 roods and 0 perches
#13a house, outbuildings, land 99.1.9 (significant)
#24 land 67.3.12 (significant-well above average)
he also was himself a landlord with 5 tenants and 2 vacant properties, houses with gardens
Since this is 1854 this maybe the father of your Edward or grandfather?
Meath belongs to a not for profit but fee paying database operated on behalf of most of the Irish Counties, depending on survival of parish record you should be able to find
the son John 1839 and any brothers and sisters for Edward
The marriage record should give you the name of the father's of both participants. Might give you witnesses.
Athboy Parish has complete RC records from 1794-1900 on the above website.
The telephone book has 200+ Brady's none from around
Trim* and there are 38 McCann's with 4 in Trim*www.censusfinder.com