You could start here - http://www.ancestryireland.com/quis_advanced.php - a Robert Miller b. 1920, father's name Robert - to see more details it costs £4, but it will give you his parents' full names and address.Regards,alocin66
James Millar married 1910 Co.Down to Elizabeth Jane Arthurs ___.Looks like James Milar, wife Mary and baby daughter Martha in 1901 census-www.census.nationalarchives.ie/pages/1901/Down/Pottinger/Vicarage_Street/1263069