Recently, I made a short video about Peter Finch's memorial marker at the Hollywood Forever cemetery in Los Angeles. The marker says 1912 birth year, but nearly all other sources say 1916.
1916 was the accepted birth year when Peter Finch died in 1977 (see all the obituaries). And two biographies soon appeared, in 1979/1980, with many pages and details about his early years -- all constructed around a 1916 birthday.
Yet, from Find-A-Grave photos, it appears the family changed the crypt's birth year from 1916 to 1912, maybe around 2002 (below).
It seems very unlikely that the family would do that without good information, doesn't it? But it 'blows up' the biographies to do so.
The Accepted Story
The accepted information is this. From Wikipedia entry to the two main biographies, Faulkner: Peter Finch. and Dundy: Finch Bloody Finch. (See also a remarks about Peter's upbringing in his second wife's memoir, Yolande Finch/Finchy.)
By any measure, Peter Finch's first 15 years were a whirlwind and global series of events.
Peter's legal father was George Finch, born in Australia and educated in chemistry in Zurich and London, arriving in London in 1912. *His* parents were Laura and Charles Finch, Peter's grandparents, who become important shortly.
George Finch came to London in 1912 and married Alicia (Betty) Fisher in 1915. Peter was born in September 1916, but his birth not recorded until 1917 for reasons unknown.
George Finch was soon convinced baby Peter's real father was one Jock Campbell. George Finch snatched away Peter at age 2 in 1918, and got a divorce (on grounds of "uncontested adultery") in 1920.
After 1920, though legally in care of his now-divorced father, Peter was raised in the early 1920s mostly by his grandmother Laura, who now lived in Vaucresson (west of Paris, near Versailles). Laura was by now permanently separated from her husband Charles Finch, who had returned to Australia.
Peter was sent to Australia in the mid 1920s, possibly during a trip to India with Laura. So by the mid 1920s, Peter was being raised by his 83-year-old grandfather Charles Finch in Sidney, along with grandfather's sister. These two both died, and Peter was passed on to another of Charles' sisters, whom he described as wicked.
Most sources suggest Peter soon spent several years as an Australian ranch hand, then, became a "cub reporter" to the Sidney Herald, and then, got into acting via a brief period in radio announcing.
1912 or 1916? Age 2 or 6? Age 6 or 10?
If, as the current family gravestone indicates, Peter was born in September 1912, it would seem to be before his mother Alicia had met either biological father Campbell or legal father Charles Finch. (And this pushes his concept to January 2012).
And on the 1912 timeline, his mother would have brought a 3 year old boy into the 1915 marriage to Finch. And Peter would have been 6, not 2, when as the story says, he was snatched from his playpen by his legal father in 1918. Peter would become 8, not 4, when his parents divorced in 1920.
Both biographies have a couple (different) dated pictures of the young Peter Finch, but it's hard for me to tell if he's more likely to be (say in 1924) to be 8 year old big for his age or a prepubertal 12 year old small for his age.
A few final clues. One biography says that Charles Finch never talked about Peter's paternity or infancy. And several sources note that his birth certificate was issued, at least, a year late in 1917.
A few web sources that are built around the grave itself, like Find A Grave, do list the birth year as 1912, like the current marker, and not 1916, like all the books and like the first marker.
Campbell Story Seems Secure?
After 1920, newly divorced Alicia Finch soon married Jock Campbell and they had a long marriage together into the 1950s.
Yolande Finch asserts in her memoir that Alicia Finch Campbell wouldn't discuss Peter's origins.
But in contrast, at least one of the biographers interviewed Finch's mother and she was happy to acknowledge her and Campbell's parenthood of young Peter.
One of the biographies describes Peter Finch passing time with the Campbells in the 1950s, and they happily discussed his paternity and indeed, in some speeches Peter described himself as a proud Campbell for Scottish audiences.
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Find a Grave, "new plaque 2002." https://www.findagrave.com/memorial/337/peter-finch/photo