If your William Hamilton is from Ireland you will need at least a county or townland that he was from to do further research. Irish genealogy is challenging but given the estimated time frame for his birth, there is documentation available as there was required civil registration of the birth beginning in 1864. Since they were married in Scotland and you have that information, go back to it and review it to see if there are any hints as to where in Ireland. Do you have a middle name or exact date of birth? Both are more than helpful _www.familysearch.org_ (http://www.familysearch.org) Has 217 William Hamiltons born in the whole of Ireland, in the time frame ranging from 1881-1891. With year of birth or middle name you can narrow that down to which ones might be him and send to Roscommon Ireland for a copy of the birth certificate. Cost is minimal and they accept fax and credit card. Good luck in your search. Janet