Ken was one of nine children of Patrick William Jubb and wife Mary Alice (nee Finlayson). (The Age)
There’s no determiner like ‘his’ in front of ‘wife.’ Did the paper miss it or is it a possible expression?
Here Patrick and Mary are coupled, as the children are both of theirs. This is also not a common phrase we use in day-to-day speech but part of a specific tradition of writing obituaries.