You adopted Keira and Stewart, they are fraternal twins. Stewart doesn't like you that much so he spends a lot of his time in his room, so you end up spending a lot of time with Kiera. You're a good adoptive mother.

...

You were brushing Keira's hair while she sat in front of a mirror. It's Keira's birthday today and you wanted to make her look good for her party. "Mom," Keira took a deep breath. "I want my biological dad to be here for my party." She had never mentioned her father before...