Roman Catholics and Divorce simply do not mix, so it is more likely to be a separation. He is not found on the NSW Dec 1913 electoral roll and still not around in July 1915 .... and not noted as deceased with Sidney marries Dec 1916.
When Sidney married Eileen on 9 Dec 1916, the reverse side of the mc shows that Patrick give his place of birth as Portland NSW, and that he was aged 23 years, His father was Patrick HEFFERNAN, an Engineer, Trangie and his mother was Ada SALMES. The printed form clearly required the Clergy to indicate against the names of the parents any who were known to be deceased
“ † If deceased, the fact should be stated”
Add a snip, I think it reads Engineer Trangie for Patrick's occupation. What do other RChatters think?
Noting NO sign of the †
Cheers, JM