The process of shopping spree can be a bit confusing as to how this works. So here's a brief walk-through:

If you have four members in your family your child will be buying 3 total gifts:
1 for Dad
1 for Mom
1 for brother/sister

You will send in 3 gift donations (unwrapped) for the "store" that the school will setup in the gym:
1 item that most Dads will like
1 item that most Moms will like
1 item that most brothers/sister will like

You will also send in an envelope with three $1 bills inside, which Your child will use to purchase the 3 items he/she selects. The envelope should have your child’s name on it, as well as the names of the gift recipients. Please also include ages of siblings.  (Dad, Mom, brother/sister age)

On the day of the shopping spree, your child will go shopping and select three gifts from the collection of donations. The items will then be gift-wrapped and labeled for them to bring home for their families.

Children really enjoy participating and presenting their gifts to their family members. I hope you'll consider joining in!