I'll try and get Georges parents and were he was born.
I see that George Tosh and Isabella Addison were married in Marykirk in 1861. The marriage certificate will tell you the names of both sets of parents including their mothers' maiden surnames.
They had at least six of a family
John, 2 June 1862, Lethnot and Navar
Margery Stewart, 8 February 1864, Oathlaw
Betsy Kennedy, 19 October 1865, Menmuir
Christina, 27 November 1867, Forfar
George, 7 March 1870, Inverarity and Meathie
Mary Ann, 26 May 1872, Murroes
In the 1871 census they were in the parish of Inverarity (except Mary Ann of course). The original of this census, also on Scotland's People, will tell you where George was born.
Barring creative spellings of the surname, there don't seem to be any Toshes in any census in Lethnot and Navar.