Why is my Step-dad always mean to my younger sister?

I dont know but you should tell your mom or something

Explanation:

Some step parents can be very mean to their step children but without more info I wouldn't really know how to help you.

Things like this are very sad though and if its getting really bad or out of hand then you might want to call CPS or tell another adult.

on june 23, 1972, the president signed title ix of the education amendments of 1972, 20 u.s.c. into law. title ix is a comprehensive federal law that prohibits discrimination on the basis of sex in any federally funded education program or activity.