Hi there,
Yes, I would expect to see Susan's given name on her father's d.c. provided she was alive when he died, and the informant knew of her. However, rather than suggest you spend bucketloads of pennies on transcripts of all the NSW certs, I'm trying to think of the ones that would give you the most amount of reliable information for the least amount of penny spending. So, in suggesting the 1859 civil registration for the birth of her bro, I am thinking that both his parents were alive, one would have provided the info (and be named as such) and the names on that cert would include all his older siblings as well.
The information on a b.c. would be given at a time of joy. Perhaps the older siblings were with the informant when it was being registered, and so able to help with the information. On the otherhand the information given on a d.c. is given when the family members are experiencing grief, so it may not be as reliable as a b.c.
I also think that the information on a m.c. can be reliable, especially where both the bride and groom have no previous marriages, and there's no suggestion of any hasty marriage. However, there's rural civil NSW m.c's from those decades (1856 - at least 1895) where the vital family history info has not yet been included in the NSW BDM registrar's records (ie missing info includes the occupations of the bride and groom's fathers, the names (including nee names) of the parents of the bride and groom, the ages of the bride and groom, etc).
Fingers crossed, and don't forget that of course there are many RChatters with better understanding than me of the NSW BDM processes.
Cheers, JM
