From your earlier thread -
".. the marriage in Brisbane in 1877 is stated on each of the 9 children's birth certificates, and yet it is not listed with the QLD BDM."
Can you please identify the nine births......,name, year and location........ you have for John Edward DUNNE and Margaret KELLY?
When giving information for the births, the informant would not have to produce evidence of the marriage.
What age is mother Margaret at the birth of the first child?