Hello there my dad's name is Brian Insch and his father was from Peterculter and we have also got family in Australia so this could relate to your story, my dad's fathers name was Alastair Insch but he also had a brother called Walter Insch who moved to South Africa! He also had step brothers and sister and there last name was Forsyth! if this is any help!
Thankyou and please somehow get back to us! if you don't reply back on this! ill give you my email which is: xoxepi@hotmail.co.uk