To add to the above questions-
grt grandfather John McAleese may have come from Dervock
What indications do you have to think he might have come from Dervock?
Start with the facts you already know and tell us-
Marriage certificate (1887)- how old is John, what is his occupation and what details of his parents are on the certificate?
Death certificate- details of parents?
Where does the information John had a sister Sarah/Sally that married ? Winters come from?
If we have the parents' names there will be Irish records to check but not much point in us wasting time without full details to start with. If you don't have the above Scottish certificates they can be easily viewed on Scotland's People site for a few credits. It would alo be worth checking for John in each possible census in case other family members are staying in the household.