I am so excited to see that you are offering the family 4 pack to San Diego Zoo Safari Park.  My two youngest kiddos share a birthday of January 13.  My son is about to turn 11 and my daughter is about to turn 7, two siblings on the same day was "cool" for them the first 3 years.  Then, the obvious differences of girl vs boy, brother vs. sister, and age became more of a headache instead of the "greatest gift of having a little sister as a birthday present" as it once was. We are hoping to make a first-time ever trip to the San Diego Zoo the perfect day of shared celebration!