Richard Halstead- 1820 Settler with Hayhurst party on ship "John"

I believe there is an error with the name "Caldecott" in the children's names. Can anyone please either rectify or collaborate this?
Also, Thomas, the eldest child, is a child of Richard Halstead from a previous (unknown) marriage. Wife Ellen is not Thomas's mother.

The following is currently showing against them in the Geni, 1820 Settler Hayhurst Party listing:
Richard Halstead 36. Dyer.
Wife Ellen 21.
Children :
Thomas Caldecott 9
James Caldecott 4
Nancy Caldecott 2

Thank you to anyone who can assist, Carol Gainsford