Hi Andy
I have found a Baptism on the Jersey Heritage trust website for a
James Thomas Cheney born 25 Feb 1884, Baptised 16 Mar 1884,with Parents Joseph Thomas Cheney and Margaret Jane Donoghue, fathers occupation Mariner
Also on the 1891 census RG12/4694 folio 171 page 22
Joseph and Margaret with children Joseph, George, John, James, Margaret and Walter
Could these be your family, i can give you a full transcription of the census if needed
Regards
Sal