Hi Barbara, Thank you for the details for Catherine, that ties things up better. My 3X Great-Grandmother was a sister to Catherine's first husband George Seward Treacy.
I have 7 children for Colin & Catherine McRae.
Anabella McCrae 1841 Melbourne B.Cert No 12427
Catherine McCrae 1842 Melbourne B. Reg No 12874
Daniel Stodhart McCrae 1845 Melbourne B.Reg No 14115
Alexander McRae 1847 Melbourne B.Reg No 333242
Colin McRae 1850 South Yarra B.Reg No 16758
John McCray 1852 Prahran B.Reg No 6818 (this was St Francis -Roman C, Prahran is near South Yarra)
Donald MacRae 1854 Prahran B. Reg No 6391 (no church mentioned)
I've added Reg Nos incase you wish to sent for certificates.