Hi conwaygang, you have probably already found the marriage online which seems to belong to your ancestors Patrick and Margaret
on 3 February 1838
Parish/Church/Congregation - BALLYBUNION
Area - KERRY (RC)
Patrick's address is given as Dromin.
There are 9 returns for the townland of Dromin in Griffith's Valuation
If Patrick's baptism 1841 belongs to this Patrick & Margaret the townland given in the Church records is Clash in Causeway RC Parish.
There is only one entry for a Patrick Conway in 1852 in Kerry (Note that the Poor Law Union is Tralee)
Griffith's Valuation Record Information
Tenant
Family Name 1CONWAY
Forename 1PATRICK
LandlordFamily Name 2CommonForename
2LocationCountyKERRY
BaronyCLANMAURICE
UnionTRALEE
ParishARDFERT
TownlandCOMMONS, WESTPlace
NameCOMMONS, WESTPlace
TypeTOWNLAND
It would be worthwhile to check the Civil Registration death records which are also free online at irishgenealogy.ie although given the time frame Patrick and Margaret's deaths may not be recorded.
Is there a possibility that they went to the States also?
It would be unusual if they only had 3 children unless Margaret died young so it might also be worthwhile to search the marriage records for Children of a Patrick Conway marrying after 1848. You may be very lucky and find the mother's name listed also.
I hope these suggestions help you a little. Do let us know if you find anything.
Martine