If you have access make sure the tree is well referenced ie the sources are cited....and even then you still need to check them yourself and I understand ancestry give 'hints' that aren't always correct but people post the 'hints' to their tree.
Cando
...and many of them have confused the families of the two couples - Thomas REDFERN and Clara HIGGINS (married 1874 in Sydney), and Thomas REDFERN and Clara PAINTER ( married 1867 in Victoria).
Debra 
I think the NSW 1874 marriage cert may be another example of some elusive blanks on the cert NOT being followed up with checking the parish registers for the details of the bride and groom and their parentage. Sadly, those hurdles were recognised by family history buffs long before the internet came along, and the family history buffs were prepared to write snail mail letters to the local clergy to gain that elusive info.
I see NSW BDM website has made mention of these blanks, so perhaps my thread on that topic can be moved off to the COMPLETED board shortly

I quote :
"The task of reconciling the Early Church Records and amending the marriage registrations was never finalised. The Registry's records from these years are not complete and it can be worthwhile for genealogists to contact the relevant church to find details missing from a marriage certificate or in the case of a birth, a baptism record where there is no corresponding civil registration." http://www.bdm.nsw.gov.au/familyHistory/historyofRegistrysRec.htm Cheers, JM (fingers crossed the regulars with 1918 Pioneers Index can rescue us SOOOOOOON)