Selina Ann and William are buried at Rookwood Cemetery - Old Church of England, Section 3, Row 12, Grave#365
William SWEET
1 Apr 1929 74 years
My husband
Selina Ann SWEET
2 Sep 1935 77 years
Wife of above
So now we we know that William was born c1855 with parents William and Ann.
Also at Rookwood Old Church of England Section G, Row 10 Grave#321
Arthur Bowen SWEET
23 Feb 1883
11 mths
Albert Edward SWEET
25 Jan 1887
4 yrs 3 mths
Jane COBBY
2 June 1910 81 years
Grandmother of above
Death
4852/1910
COBBY Jane
Father John Mother Jane
District Burwood.
Once again certificates or transcriptions of certificates wil help you further with your research. I will see if I can find anything on William and Ann SWEET in England.
Cheers
Cando
Cando