James is missing from the 1861 and 1871 census (presumed dead).
There are 11 possible recorded deaths for James Brooks between 1854 and 1861, so cannot be sure of age, but assumed he died young.
General Notes
There was no James with the family in the 1861 or 1871 census. It is therefore assumed that James died as a child between 1854 and 1861 (there are 11 posible matches).