this looks like part of the family in 1841
Lake Field Cottage, St Mary Magdalene, Launceston HO107/1841 folio 18 pg 29
John Holman 70 farmer
Elizabeth 65
Richard 14
Elizabeth 13
John 11
Richard 10
Sarah Uglow 25 not born in county
Elizabeth Uglow 3 months
Fanny White 4
all except Sarah Uglow born in county
Elizabeth Uglow baptised 25 March 1841 at Launceston daughter of Richard, baker, and Sarah of Lake Cottage.
In 1851 she is living with her Holman grandparents in Bodmin
https://www.familysearch.org/ark:/61903/1:1:SG28-9FRJohn is a Chelsea pensioner. He was buried in the churchyard at Bodmin aged 89 13 Sept 1858, Sergeant RCM.
Likely baptism for Sarah at Portsea, Hants 12 Sept 1813 daughter of John Holman, Sergeant in the Royal Cornwall Militia, & Elizabeth of Portsea Barracks.
When James Holman remarried in October 1858, his father is noted as John, sergeant in the RCM.
James Pendennis Holman was baptised at Falmouth 8 July 1804 son of John & Elizabeth.
Sarah Uglow is living with her Uglow in laws in Plymouth in 1851
https://www.familysearch.org/ark:/61903/1:1:SGJQ-NKQPerhaps it was easier to ask Sarah about his date of birth as she was nearer. Or he fell out with his father after his remarriage. It looks like the same family to me.