Have found that Jane Duncan Ferguson was born 1857 in Greenock and her sister Elizabeth Bain Ferguson 1860 in Greenock. Their siblings were born in other areas, Frederick Ferguson was born around 1855 in England (unsure of location). Mary around 1851 Glasgow and Christina again unsure of date but born Lanarkshire.
Mary Ferguson married patrick McGinniss and had 2 children (of which I know), Frederick married Annie Darroch and had 2 children Janet(c1881) & Christina(c1883). Elizabeth Married Robert McNab and had at least 5 children. John McNab(1883), Charles McNab(1885), Henry McNab(c1887), Martha McNab(1888) & Frederick McNab(c1890).