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Here he is in 1920 , living with brother Thomas :

https://www.familysearch.org/ark:/61903/1:1:M6B6-VJH

Garfield Jenkin made a Declaration of Intent to become a naturalized citizen in Pittsburgh 1 Sep 1936.
The record gives dob as 20 Aug 1895 and birthplace Mousehole. He was single and living in Braddock Avenue, Braddock. He travelled to the US on the Oceanic 19 Apr 1911 , according to this document.
I cannot find a free image for you but familysearch has details of his Naturalization Card dated 1940.

https://www.familysearch.org/ark:/61903/1:1:7FN5-PJ3Z

New York State Marriage Index :

Orvis C FETZER and Gwenneth OVERALL 1965 Buffalo NY

The names are shortened in the index , but an Ancestry tree has the date as 12 April 1965.
EDIT above already posted by polarbear.
She appears to have lived in the Bronx and Buffalo :
https://www.familysearch.org/ark:/61903/1:1:KVJ5-7ZR

https://trove.nla.gov.au/newspaper/article/99778865?searchTerm=%22doris%20peisley%22

This report of the wedding of Doris Peisley and Ernest Jacobs gives her parents as Mrs A Peisley and the late Mr Peisley of Evans Street Goulbourn. It also mentions her sister Josie and brother F PEISLEY. So did Alice remarry or is there something wrong somewhere ?

There is a Sybil FOGEL on the London  Electoral  Registers in 1934 and 1935 in Hackney :

1934
209 Albion Road
Maurice FOGEL
Milly FOGEL
Nathan Alec FOGEL
Sybil FOGEL

1935
209 Albion Road
all names as above

Earlier entries in the Registers indicate that Nathan and Millie FOGEL are the householders. I can find the couple on the 1921 census with their children but there is no Sybil in the family. The nearest birth of a girl I could find on GRO is Sarah FOGEL. Certificate details as follows :

15 March 1913 at 36 Richard Street / Sarah / girl / Nathan FOGEL / Millie FOGEL formerly SCHAFFER /Tailors Presser / N FOGEL father 36 Richard Street

I believe I have found  Nathan FOGEL , with wife as Minnie , in 1911 here :

https://www.familysearch.org/ark:/61903/1:1:XWG1-QSQ

It seems unlikely that Sarah FOGEL is Sybil and it is possible that Sybil FOGEL is related to this family but is not a daughter of Nathan and Millie. I cannot get any closer to making a connection. In addition Henry & Sybil AUDLEY are on the Electoral Register  in Chelsea in 1947 with Kate FOGEL , but I haven't been able to connect Kate FOGEL either.

The marriage certificate seems the only way forward.