Hi Ambly
Thanks for your response. You're on the correct family
JAMES NEILSON was born 19 May 1810 in Kirktown, Fortingall, Perthshire, and died 09 Mar 1868 in 16 Duke Street, St Andrew, Edinburgh, Edinburgh. He married (1) FREDERICA ANNE ELIZA DE LISLE 26 Sep 1845 in Treesbanks House, Lanarkshire, daughter of ROBERT DE LISLE and FREDERICA MILLS. She was born Abt. 1824 in Paris, France, and died 03 Nov 1859 in 3 Abercromby Place, St Andrew, Edinburgh, Midlothian. He married (2) ANNE HELEN RATTRAY 02 Aug 1864 in St Andrew, Edinburgh, Midlothian, daughter of THOMAS RATTRAY and JANET NESS. She was born Abt. 1821 in Bloomsbury, London, and died 12 Nov 1905 in Woodcliffe, Upper Bridge Street, Stirling, Stirlingshire.
Children of JAMES NEILSON and FREDERICA DE LISLE are:
i. FREDERICA MARGARET ARCHER NEILSON, b. Abt. 1852, Edinburgh, Midlothian; d. 23 Feb 1930, 2 Closeburn Terrace, Feus Road, Tibbermore, Perth, Perthshire.
ii. ROBERT DE LISLE NEILSON, b. Abt. 1854, Edinburgh, Midlothian; d. 03 Aug 1918, Sydney, New South Wales, Australia.
iii. ELIZABETH MURRAY BROWN NEILSON, b. 21 Jan 1855, Edinburgh, Midlothian; d. 30 Mar 1865, 3 Abercromby Place, St Andrew, Edinburgh, Midlothian.
iv. WILLIAM CHARLES NEILSON, b. 15 Apr 1856, 3 Abercromby Place, St Andrew, Edinburgh, Midlothian. -
THE MYSTERY SON1861 Census Residing at 3 Abercromby Place, St Mary, Edinburgh, Midlothian
v. CECILIA CHARLOTTE SMYTH NEILSON, b. 26 Jul 1857, Edinburgh, Midlothian; d. 27 Feb 1859, 3 Abercromby Place, St Andrew, Edinburgh, Midlothian.
The first son ROBERT DE LISLE NEILSON was in the 1861 Census residing at Keith Park, Blairgowrie, Perthshire as a Boarder/Scholar in the home of Susan Inches, her sisters Jessie and Mary - Boarding School Teachers - as was his sister FREDERICA.
All the other siblings check out. I hope this helps?
Regards
Chiad Fhear