My first ancestor in Australia was Thomas Trevithick born 1835 Kenwyn, son of William Trevithick and Ann Watkins Allen, died Hill End NSW 1913.
There has always been a suggestion that this line is descended from Richard Trevithick. I've had a great deal of difficulty establishing Thomas' parentage, but this is how I believe it goes.
Thomas was born in 1835, baptised in Kenywn, Cornwall.
Source Cornwall online parish clerks site:
Parish: Kenwyn, Date: 08-Mar 1835
Name: Thomas TREVITHICK
Parents: William and Ann
Residence: St Clements
Father's rank/profession: Labourer
Thomas' third marriage certificate in 1900 in Hill End NSW to Mary A GREEN confirms the names of his parents as William and Ann nee ALLEN. Some confusion arose I believe because when Thomas married his first wife Elizabeth Randal CANDY in 1853 in Plymouth, England his father is stated as Thomas, a Gardner. Thomas and Elizabeth's arrival records on the 'Panama' from the Victorian PROV would help - but they don't allow people to order like in NSW so are inaccesible to me.
I had a great deal of difficulty finding a marriage for Thomas' parents William TREVITHICK and Ann ALLEN, this is because Ann ALLEN first married William PENGILLY in 1827:
Parish or Registration District: Kenwyn, Date: 25-Oct 1827
GROOM: William PENGILLY
BRIDE: Ann Watkings ALLEN
William PENGILLY died in 1830, Age: 40, Residence: Kenwyn Street, after they'd baptised only one child, William Henry, in 1828 (IGI).
The widowed Ann PENGILLY then married William TREVITHICK in 1834 (From Cornwall Online Parish Clerks site):
Parish or Registration District: Kenwyn
Date: 09-Jun 1834
GROOM: William TREVIDICK (Trevithick)
Groom's condition: Bachelor
BRIDE: Ann PENGILLY
Bride's condition: Widower
Witness 1: Thos Hicks
Witness 2: (mark of)Margaret Courtice
I believe a combination of the incorrect writing/transcription and Ann ALLEN's intervening marriage conspired to make it difficult to uncove them.
William TREVITHICK and Ann ALLEN/PENGILLY had two children that i've found:
THomas TREVITHICK (1835-1913), and Elizabeth baptised Wesleyan, Truro 1837 and buried aged 4 in 1842. In the meantime, Thomas' father William was buried in 1838 (Cornwall online parish clerks site):
Parish: Kenwyn, Date: 08-Apr 1838
Name: William TREVITHICK
Residence: St Clements
In the 1841 census, the widowed Ann Trevithick is living on Kenwyn St with Thomas and Elizabeth, along with her son William TREVITICK (previously PENGILLY) from her first marriage.
So William TREVITHICK (also written TREVIDICK) was born about 1806 according to his age at death, married the widower Ann Watkins PENGILLY nee ALLEN in Kenwyn in 1834 and died in 1838 in Kenwyn, Cornwall. He was a labourer according to his sons baptismal transcript.