If someone in your home is suspended EVERYONE in your home, at your address, is unable to obtain and/or keep their account. I know this for a fact. I can copy and paste ebay messages that I have from friends to whom this been an issue.
However, there are a number of ways around this. All of which are a bit complicated but certainly possible.
First of all, IP addresses can indeed be important even with two different accounts. It is imperative that you set up two different user ids for your operating system. With each user id you will want to re-set your ip address each time you are going to log into ebay or into PayPal. Resetting your ip is relatively easy.....just turn your modem off for about a minute and turn it back on. To check to see if the ip address was re-set go to Link hidden: Login to view. They will show your current ip address. When you reset your modem and log back in go to that site again and make sure it has changed. Ebay can and does use that information to associate accounts.
If you are going to use two different accounts you want to use information for two different people. That way if one account were to be suspended, which ebay is doing at a record pace these days for the vaguest of reasons in many cases, you will not have your other account linked. There are a number of ways to do this. IF you PM me I will tell you a site you can go to with tons of information about all of this.