I would actually be most concerned about your sister. The World Health Organization has identified the Pill as a Carcinogen and the younger someone starts, the higher the risk for breast cancer.
http://www.prlog.org/10922665-birth-control-pill-shown-to-be-carcinogen.html
She should know her options.
I’ll mention it to my mother because my sister will flip out and ask “Am I going to die”?
That is the last thing we need.