I don't recall if there was any specific reason for this family gathering at Aunty Dot and "Uncle" Ern's home at St. Ives. But it was probably around Christmas/New Year time, and I think Chris Brisbane and family had come up from Melbourne. There may be as many as 4 missing photographs, which perhaps would have shed more light on others present.
Yvonne and Ron at the near table, with Keiran and the yellow dolphin. Alas, the only person I can identify at the back table is Ern (bald head). The others are not familiar to me after so many years.
Obviously summer, with the youngsters enjoying the pool. I believe that is Kelly at the far end, and I presume the two boys are Chris' sons.
Part of the back garden, with the swimming pool just out of picture to the left.
Another part of the back garden
The house, with assorted visitor's cars. Aunty Dot had a way with gardens, as can be seen here.