Parents can tell the most exciting story of all - the birth of their twin babies! "Twice Upon a Time" is a set of 2 of baby memory books written just for twins. They are unique in that they tell a fairy tale, combined with the tale of Daddy and Mommy's pregnancy, their twins' birth, and first three years of life. The books include cute comparisons of the twins and also address each child as a unique individual. Full of colorful, adorable illustrations! One of the nice features about this set of books is that it's VERY EASY to fill in the details. Much of the work is already done for busy parents, with lots of "check-the-box" options. Don't get us wrong, there is SOME work to be done, but it's not overwhelming!