Hi Shelly!
Currently when you order the PhotoPass Photo CD, you can order additional copies for $19.95 (though subject to change). My most recently purchased PhotoPass CD has the terms and condition (which you have the opportunity to read upon purchasing on the PhotoPass website), and it states that while you may not make duplicates for commercial purposes (you can't sell copies), you may make duplicates for the purposes of gift giving (such as for your family members).
Remember that there is no limit to how many photos you can have on your PhotoPass CD, so I encourage your whole family to use PhotoPass throughout the parks. You can even combine the PhotoPass cards onto one family members account to add them all onto the same PhotoPass CD (and avoid having to purchase separate ones). If you have a large sum of photos, they'll be placed on multiple CDs, but you'll still only pay for one PhotoPass CD order.
Oh, and if you haven't already, check out the great
pre-arrival special offer going on now, which includes a discounted rate for pre purchasing a PhotoPass CD, and there's also an offer for a PhotoPass CD and Photo Book.
Have a magical vacation!