He was born in Roehampton, Surrey on 11 May 1841 the third son of Abraham George Robarts (1810-1860) and Elizabeth Sarah nee Smyth (1816-1864).
In 1841 he's found with his parents at Besborough Cottage, Roehampton, Surrey, in 1851 he's a pupil at Berkswell Hall, Berkswell, Warwickshire and in 1861 he's enumerated as a banker - presumably with the family bank - with his mother at Russell Farm, Watford, Hertfordshire.
On 21st June 1862 he married Isabella Dorothea Sherlock and they had:
- Catherine Elisabeth Fitzroy - 28 May 1864 - 1916
- Fitzroy John 2 Mar 1866 - 2 Dec 1936
- Fitzroy Clinton 1873 - 1905 (presumably named posthumously after his father)
And that's about it except that he died on 17 June 1873 in Antwerp and that his daughter, Catherine, appears to have married - or at least had a son by - Victor Antoine Rochet (1857 - 1914) named Charles Rochet b. 1891
Isabella lived on until 1920 dying in Antwerp and outliving two of her children.