Given how often nephews pop up in the households of extended family, in case you don't have these...
1861 and Isabella Munro MacKenzie now a widow:
Isabella Mackenzie 44 Head Fund Holder b. Skye
Gilbert Pooly Mackenzie 13 Son b. Demerara, british guiana...died at sea in 1890
Donald George Mackenzie 11 Son b. Demerara, british guiana...died in India 1885
George Gordon Ross 15 Nephew b. Demerara, british guiana
Donald Frederick Ross 13 Nephew b. Glendaruel, Argyleshire
Margaret Robertson 39 Servant
Janet Orr 40 Servant
Helen Harvey 16 Servant
Address: White House, Inveresk (still there!
www.onthemarket.com/details/3138148/)
Were the Ross boys sons of John and Donald's sister, Isabella MacKenzie? Some sites have her married to a Ross?
However, there is a Scottish birth entry in Kilmodan, Argyll for a Donald Frederick Campbell Ross, son of George Ross and Christina Flora Munro (then connecting to Isabella Munro). Wondering therefore if this is a jumble and people mixing lines up?
George Ross was planter in Demerara and married Christina (said to be his cousin) c.1844 in Demerara. Christina, in some researchers' notes, is described as 'Christina Flora Munro dau of Donald Munro excise officer Skye 1776 and mother Mary MacRae). I think the Ross boys are very likely Isabella Munro's sister's sons. The Ross family look to have headed off to Australia.
Monica
ADDED: There are some many linked threads with these families...! I thought the property name where Isabella Munro MacKenzie showed as living in 1861 rang a bell....we have this as the place Mary Bell's mother, Elizabeth Robertson, died in 1813:
At White House, Mussleburgh, Elizabeth Robertson wife of Charles Bell Esq., wine merchant Leith.
The Scots Magazine and Edinburgh Literary Miscellany, Volume 75, Part 2, 1813