If Lawrence is listed as Robert's grandson in 1901 (b.1887)then I wonder who his father and mother are. Robert and Mary's oldest son or daughter are old enough to have a son of that age. But in 1891 (b.1889) he is listed as his son or maybe Lawrence is the son of one of Robert and Mary's children. Christy and Stephen seem to be absent from the 1901 census. Stephen was a mariner which could be why he is absent from the 1901 census and maybe he left Lawrence in the care of Robert and Mary.