You have gotten some good advice from Yorkiemom1. You will need to be very, very careful as you are getting your little puppy too young and so tiny.
As we have seen very recently here at YT - these tiny, young puppies can go down very quickly. We don't want you to experience that heartache so please keep posting.
I think your little one is going to be far too young and small to be left alone for any length of time. It's good that your sister will be there. The little puppy can get dehydrated very quickly or get hypoglycemic.
Best of luck and please post photos if you get a chance.
__________________ Mommy to Lucy, Ringo, and Matthew |