Are my sisters included on my renters insurance??

[longnguyen]

I am about to move in with my 2 sisters and I set up renters insurance wuth Geico but it only let me add one of them to my policy. I added the other sister as an authorized user of the account but she doesnt show up on the actual proof of policy. It says that relatives are included but it only describes spouses and children, do siblings count as well? Do you think my landlord will accept just two of us or should we just get another policy??