I know this post is very old, but I have some information on this family as Elizabeth Ruthven Kennedy and Andrew Napier are my great grandparents.
Andrew did not emigrate to Canada, but remained in the UK and remarried. Elizabeth emigrated and died in Montreal Quebec.
If you would like further details please let me know, I have a decent amount of information and details re Elizabeth's solo immigration.
Warm Regards,
Wendy (Wright) Zhuleku