Robert was a General Teacher at Colston's Hospital (Now known as Colston's School) in Bristol in 1851.
By 1861 he was Curate of Langford, Berkshire.
In 1871 he is staying at the Randolph Hotel in Oxford, and is Curate of Tortsworth.
Can't find either Robert or William in 1881.
According to the 1864 Kelly's Directory of Oxfordshire, with reference to Langford, Robert was at Cambridge University, Emmanuel College.
Crockford's Clerical Directory of 1885 says:
TILBURY, Robert, Brignal Rectory, Barnard Castle.
Em. Coll. Cam. B.A. 1860. M.A. 1864
C (Curate?) of Langford, Berks, 1860-64
Tortworth, Gloucs, 1864-1876
C. in charge of Brignal 1876-78
V. of Hutton Magna, Yorks 1878-84
C. of Barningham, Yorks 1878-84