A recent review of my notes and a new search linked David to an Ancestry tree. What I had previously put together and what I now know from the relative I've been in touch with is that David was the son of David William Ogilvie and Margaret Ogilvie. He was born in Eglin, Scotland in 1871. David had four siblings, Eliza (b1855-?), Annie Isabella (1859-1902), Margaret (1862-?), Lily (1868-1948) and Catherine (b1874-died in infancy).
David married Phyllis Marion O'Sullivan in 1901 and was a member of the Royal Navy. When the RAN was being established, following Federation, many sailors were loaned by the British Royal Navy to the RAN. A brief RAN service record for David is available at this link. After WWI, David and Phyllis remained in Australia. David died in 1945 and Phyllis in 1949. They did not have any children.
Through Ancestry I've been in contact with Doug who is the great grandson of Annie Isabella.
Thanks go to Dave G who originally sent the medals to me.
The returned medal tally is now 2455.