i didn't have anyone particular in mind, so long as they can pass for siblings i'm fine with any face you'd like to use! she can be anywhere between the ages 24-30 if you want, their family history is kind of rocky but here's the tl;dr version: dad died in a car accident that aerin was also involved in shortly after she turned fifteen, so the younger the sister is the less she would likely remember their dad. that can be all up to you though! i set her sister's age as 29 in her bio but i have no problem changing that or her name for that matter.