We have been seeing a lot of Club Penguin Island players and reserved players asking if you are able to purchase multiple Memberships for your Penguins, and other created ones on your App Store account, and the answer is No. You can only have one current purchased Club Penguin Island Membership on your App Store account and this includes Family Accounts. Multiple Membership purchases cannot occur under the same account because the account will recognize that it already has an active subscription.
But of course there are safe and simple ways around to getting multiple Memberships for your Penguin Family. That involves you creating multiple App Store accounts, and purchasing one Club Penguin Island Membership on each of them, but remember to ask a Parent or Guardian before creating a new App Store account.