Sister versus best friend [Jack Johnson]

Lorelai - or Rory, as everybody calls her - is a girl, who had been growing up in Omaha.
Her little sister, April, and her have the strongest bond ever;but her best friend, Jack, and her are inseparable.
When your sister and your best friend - previous idol - were dating, and you suddenly have to choose which side you are one... Which would you choose?
That is the quandary Lorelai is up against.
She do not want to loose them, and cannot choose both sides... Or can she?