In 1851 Robert (9) was with Charles and Elizabeth Yates at Wigan, their grandson, and probably the son of Euphonnia Calderwood (28, a step-daughter).
In April 1861, Robert Calderwood (20), a British Subject, born in the USA was a Brass Turner, lodging with Wright and Sarah Mather and family in Little Bolton.
In Q2 1861, Robert Calderwood married Alice mather (a civil marriage, possibly Methodist). There are no obvious close relatives of Wright Mather who could be this Alice.
In 1862, Elizabeth was born and baptised in Little Bolton.
After 1862, there is no death of any Calderwood in Lancashire. It appears Robert (and Alice and Elizabeth) returned to the USA (Nebraska).