Thomas Morrison and Ann Geggie had either 11 or 12 children, most of whom died quite young, several as adolescents.
I can't track down William but otherwise John seems to have been the only child who married and stayed in Scotland
Three of Thomas Morrison's children migrated to Australia , perhaps better for their health. Helen married James Ferguson (my interest is the Ferguson line) and migrated to Victoria. She had 7 children, two of whom died in WW1
The marriage was reported as "At 67 Great King Street, Edinburgh, on the 12th Inst, by the Rev. R. H. Muir, Dalmeny, James Ferguson, Gawler, South Australia, to Helen Scott, only surviving daughter of the late Thomas Morrison, Wester Dalmeny, near Edinburgh."
Robert Hugh Muir Morrison (named after the local minister) also migrated to Australia where he was a pastoral agent and died in 1897.
The other one to migrate was Alexander- see below
Alexander Morrison (15 March 1849 – 7 December 1913) was the first Government Botanist of Western Australia.
Born in Western Dalmeny, Scotland, he began a medicine degree at Edinburgh, but suffered from ill health, prompting him to break his studies and visit Australia. He spent two years in Melbourne before returning to Edinburgh to complete his degree. He then undertook post-graduate studies at Glasgow, Würzburg and Vienna.
He returned to Australia in 1877 as a medical officer on a migrant ship. He practiced medicine in Melbourne for 15 years, but again ill health prompted him to travel. He visited the South Seas and spend some time living in the New Hebrides, where he collected plants for Ferdinand von Mueller.
After returning to Australia, he was appointed the first Government Botanist of Western Australia, holding the position from 1897 to 1906. He produced few papers during this time, but these were considered high quality work. Plant taxa published by him include Acacia densiflora, Acacia longispinea, Angianthus acrohyalinus (Hook-leaf Angianthus), Calandrinia creethae, Calandrinia schistorhiza, Drosera bulbigena (Midget Sundew), Drosera occidentalis (Western Sundew), and Indigofera boviperda. He also collected numerous specimens; for example he collected the type specimens for Eucalyptus ebbanoensis and E. platycorys.
Morrison was retrenched in 1906, thereupon returning to medical practice. In 1912 he was appointed assistant botanist to Alfred Ewart at the National Herbarium of Victoria. He died at Cheltenham, Victoria the following year. He bequeathed his herbarium to Edinburgh University, his library to the University of Tasmania, and the remainder of his estate to the University of Melbourne.