Castletown is not in Andreas - in 1841 Robert was with parents at BallaClucas in Andreas parish (Andreas is in North of Island - Castletown in Malew parish is in south - parent John was a fisherman
(Ballaclucas is in the west of Andreas 3km west of Andreas village

by 1851 John described himself as proprietor of 4 acres (a small holding) at Ballamig? diff to read and not sure) in Andreas - judging from nearby census entries this is near or same place as Ballaclucas