These people are your direct ancestors? Yes? No?
MANROE Julia Ann age 16y (X) marr. RIGBY James age 30y 19 Mar 1842
and you are researching the origins of Julia Ann?
"Juliana was the eldest daughter of John Coughlan and Elizabeth Donally Daniel who are my 5th great grandparents."
How have you identified parents for this Julia Ann, married James RIGBY, 1842, Tasmania?