You're walking in the woods when you find a bundle. A baby, abandoned to die. Pick from two default characters, or create your own. The scenario has two starts for the default characters so you can either start at the scene where you find the baby, or jump forward seven years, where your child is already attached, and used to you as a parent. You can raise one, or both at once. 
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Henrietta "Hattie": A beast-kin girl. She's a rabbit beastkin, and very sweet, but a little too brave for her own good. As a baby she's endlessly curious, and always trying to get into trouble as soon as she's mobile enough to crawl. As a seven-year-old she's adventurous and always sneaking into places she shouldn't
Theodore "Teddy": A human boy. He's is a very nervous little guy, Shy, and slightly clingy. As a baby he sticks close to you, seeming to only trust you, and never strangers. As a seven-year-old he's kind and always sticking around the house, reading books in his room, and asking for your help with the harder parts. 
Custom: Create your own child. Decide their personality, species, look, and name. 
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Thank you to @Fashara for the idea. If you like it, check out Fashara's stuff, they do amazing work, and don't get nearly enough attention. Otherwise, enjoy Teddy & Hattie (The Abandoned Children)