<p>That&rsquo;s why we call her mommy is a story about why someone is called Mommy. It describes how and why it is a term of endearment rather than a title. To have a mommy doesn&rsquo;t only mean having a birth mom. It can include foster moms adoptive moms step moms etc.. It teaches that as long as someone loves you unconditionally and takes care of you the way a mother should they can be called a Mommy.</p>