Do you know approx dates for Maria BRAILSFORD's birth/marriage/immigration (eldest child seems to be born 1854, so perhaps married abt 1853 & born abt 1828? Immigrated before 1856?)
Do you know where Maria and her parents were from? (I'm guessing born England.)
Did her parents immigrate to NZ too?
Perhaps you could try posting to the BRAILSFORD Board too. I know of some other NZ BRAILSFORDs who certainly would love to hear from you.