Looking for information on his father Alexander Aitken married to Isabella Morland?
Dear William
Welcome to Ireland Reaching Out!
You don't mention the religion of the above family but I assume they were Church of Ireland? I had a look on rootsireland.ie but couldn't see a marriage record for Alexander nor baptism records for any children he may have had. According to my sources C of I records for Dromara are 'lost' and so there are none available upon which to base a search. As this is the case, have you already had a look on ancestry.com to see if there are any family trees that could provide additional information?
Best wishes
Clare Doyle
Genealogy Support