We're just checking in to see how you're getting on here.
If you have more than one member registered to Premium for Family, but you're unable to use it at the same time, it sounds like you're logging in on the same account.
With Premium for Family, you and up to 5 members of the same household can each enjoy their own Premium account. This means you'll need to make sure you're using your individual log in details, to ensure you can all get rocking.
If this doesn't help, and you're still having trouble just let us know.