I am currently researching 2+ MacAllister (could be MacAllaster or its variations) brothers that settled in Co. Antrim, Ireland between 1700 - 1790. They moved from Co. Antrim towards Southern/East Ireland (Lusk, Donabate, Swords, Rush, Skerries, Howth) These 2 individuals were: (a) Charles McAlister (b. 1748) (b) And his brother James (b. ??) OR John OR "Jxxxxxxx".
They got married to 2 sisters with Cassidy as family name. Charles married Anne Cassidy (1786 or 1787) and the other brother marriage date is unknown and married Charlotte Cassidy. Cassidys of Staffordstown Turvey, Donabate, Co. Dublin.