WARNING: GRETHAN(INCEST) Don't like, DON'T READ. • Kassidy and Katelynn are two 5 year old girls, twins in fact, who have been in a foster home ever since they were born. They only have each other and they are very close. Ethan and Grayson are two 21 year old boys, also twins, who have been in a relationship for 5 years. They can't get pregnant, but they can adopt.