Mothermacree, Donald Robinson did migrate on The Lady Kennaway with 10 of his 12 children aged between 30 and 6 years of age. The third son James was married to Mary Frazer who gave birth to a baby daughter (no name noted) enroute on the 17th Jujy, 1838. The other two children - Catherine a widow with two children migrated in 1854 and Donald/Daniel born 1816 migrated to Port Philip Bay (Melbourne) in 1848 but living in NSW by 1854, together with his wife Jane McLaclhlan and daughter Nancy aged 1. Four other children followed.
Ann born 1827 (my gg.grandmother) married James MacDonald in 1850. He was born 1818 in Lerwick, Shetland Islands, son of Neil Macdonald (Chelsea pensioner, born in Barra, Western Isles) and Barbara Jamieson from Shetland. On the wedding certificate bride is listed as Anne Robertson or Stewart. Still working on where the name Stewart came from - at the time of marriage Ann had a daughter by the name of Jane, so maybe took the name of Stewart for 'respectability'. Jane took the name of MacDonald but doubtful James was her father. They went on to have five more children. James died in 1893 and is buried in the Presbyterian Cemetery Kiama; Ann in 1898 and is buried in Presbyterian Cemetery Nowra. Looking at James's death certificate I think they may have been estranged at the time of his death.
Still hopefully of finding where Rebecca Buttar Robertson is buried, in Blairgowrie and surrounds, as in a lot of other parts of Scotland, volunteers with some help from the local Councils neglected graveyards and cemeteries are being restored/cleaned-up, so keeping an eye on Hill Church being the most probable.