As above sftp is part of the ssh tool, so if you've got ssh installed, you've also got sftp & scp.
This is a completely separate tool from vsftp, and you only need one or the other.
If I understand your ref to your father already using ftp, you may want to keep your cxn separate and use sftp or scp.
Normally ssh tools use port 22 and that would have to be forwarded in your firewall.
Its simpler than std ftp protocol, because it only uses that one port.
You can specify another port on the server end in /etc/sshd_config: http://www.openssh.com/manual.html
Remember to consider the port num forwarding on the router and the final port on the server.
scp is a simpler on the cmd line eg scp localfile user@host:/dir/remotefile, but if you're using a GUI tool like Filezilla, it will use sftp.
Obviously make sure you have a very secure passwd/passphrase on that acct.
ssh howto in Chap 17 http://www.linuxtopia.org/online_boo...ion/index.html