If my family members want to be a member of this game, I will use their Gmail accounts and make for each one an account from their Gmail(because they use samsung galaxy) so we can be more careful about rule #2 after asking about it and making sure that this is allowed.
The system records via IP addresses (and magic). Unless you have different IP addresses, there's no distinction to us. Which even then you'd need to keep a clear eye on not voting on each others' saves.
Everyone will login with separated network is that going to work ?
By the way I am not planning to do that because it is very confusing game for my family even my older brother who is an engineerer can't learn it
Provided you don't vote on each other's saves, family members having accounts and using the same internet connection is allowed, it is not a problem.
If you vote on each other's saves accidentally, you are unlikely to get banned immediately. Just make sure you don't keep doing it.