As the title says, I have a theory that Penny could be adopted because her brothers and sisters don't look like her.
his sisters have eyes closer to the blue stripe
¡Ay! Esta imagen no sigue nuestras pautas de contenido. Para continuar la publicación, intente quitarla o subir otra.
while his brothers have larger eyes
¡Ay! Esta imagen no sigue nuestras pautas de contenido. Para continuar la publicación, intente quitarla o subir otra.
they also have a dark navy blue color and they all have red eyes and their father has pigtails but with white stripes (I haven't found a picture of Penny's mom)
¡Ay! Esta imagen no sigue nuestras pautas de contenido. Para continuar la publicación, intente quitarla o subir otra.
remember this is just my theory,it's not real, it's just a fanmade headcanon
because I just realized that Penny's sisters have colored stripes