Confirming Sibla's birth/parents/siblings -
Sibla Rebecca Monteith, born 16 Oct 1854, bap 26 Jan 1855, parents Duncan and Margaret, abode Old Court House St,, fathers occpn. Boot and Harness maker, St Andrew's Church Calcutta.
Duncan Monteith married Margaret Paul, l4 September 1838, St Andrew's Church Calcutta.
Other children born to Duncan and Margaret
James Duncan 1841, Duncan 26 May 1843, Janet Margaret 14 Oct 1844, Walter Watson 8 Oct 1845, Agnes Isabella 15 Jul 1847 and Annie Lawrence 31 May 1852
The Edinburgh Evening News, 18 Oct 1892, has an item about Buckham Hugh Cossack and "Sibla Rebecca Monteith or Hossack, his wife..."