May I use two names in the First Name Field for Multiple Children and/or Siblings?

Unfortunately, our software is set up to feature only one child and/or sibling’s name in our books, with the exception of our Who Loves You? for Twins book and Hello World! Twins book. While all of our books will allow 15 characters/spaces per field, none of the other text is changed to reflect multiple children entered in the First Name field. Please preview the book that you'd like to order to make sure that the text will be acceptable to you.