Lyn,
If his father's name was James Brooks, then how about the family living at 33 Adelaide Street, Oxford St Giles in the 1881 Census - head of the household James Brooks aged 30 born Oxfordshire and son Frederick W aged 3 born Enstone Oxfordshire. His mother, Elizabeth, the wife of James, was born in Lincolnshire (at Quadring), as was an elder sister (at Folkingham, not that far away from Billingborough).
David.