Now, I could add user 'Family1' to 'Nigor' computer, and user 'Igor' to 'Family' computer, and give appropriate permissions to all acounts. Then just share the folders. It works.
Now, i am not comfortable with adding accounts to the computers for no reason other than to give them network access. For example, on my computer, 'Nigor', I have one user -- 'Igor'. I login to that acount and use the computer. If I add another account, 'Family1', it will be just sitting there, no one will ever use it on my computer. And if i decide to network more computers -- you get the picture. Every computer will have one account that will actualy be used, and the others are just there for network purposes. Things could get confusing.
Is there anyway, using domain or something, to avoid this?