Noob questions

Until recently I have been using TeamViewer to support laptops for my 
son in England, and my father-in-law. However, TeamViewer keeps flagging 
me as using the personal version for commercial purposes (I am not) so 
I'm turning to TightVNC.

I can easily use TVNC inside my house to connect to other computers. Is 
there a way to save the connection info in a vnc file so that I do not 
have to re-enter the password every time I want to connect?

There are instructions on setting up port forwarding to access a 
computer behind a firewall but this does not really help when I need to 
connect to the two external computers I mentioned above. In the case of 
an on-site router I have access to the router, physically and by 
address. How can I set up a connection to my son's computer across the 
Atlantic?

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