Johanna Katrina Harrison (Murray) - How does she relate back to Rev Andrew Murray, SV/PROG?

I believe that Johanna Katrina Harrison (Murray) is a direct descendant of Rev Andrew Murray, SV/PROG because my father Henry (her grandson) keeps insisting on this but I have not been able to make the link?

Can anybody work out how she might relate back to this profile?

Rev Andrew Murray, SV/PROG

I'd appreciate any help,

Thank you