Hi Joe & Pari Passu
I also think that it is possible that the chldren could have been taken in by other family members or placed in an orphanage or even living with older siblings, these are Sophia siblings still possibly living in Scotland at the time were
James 1820, Janet 1820, David 1827, John 1830, Jane 1830, Robert 1836, Thomas 1839 and Alexander 1844.
Thank-you both for your help
jericho