I think that is a possibility that they all migrated. I suspect I may have found a sister for Agnes in Australia. Jane Osborne Bryce Ross married Robert Haywood Ralston in Victoria Australia.( I can't find a birth record for her but she did state she was born in Greenock) Agnes mother is Marion Bryce and father James Bryce. Interestingly Jane has a daughter middle name Marion, another with a middle name Bryce, she married a Ralston, Agnes gave one of her children a middle name Ralston another a middle name Bryce. Looking in the Scottish records I think I may be on to something. I found a Marion Bryce with parents James Bryce and Jean Osborn......... Jane and Agnes and other identified siblings were born in Greenock, Renfrewshire, Scotland, James Bryce and Jean married there too...... Any help would be grateful for.