There's a couple of things to think about here. First, your boyfriend's sister cannot and should not insure the vehicle simply because she does not drive it. Second, although you do not have a license, you should still get the vehicle insured as it is required by law in North Carolina. Thankfully, North Carolina is on average 39.4%
cheaper than the rest of the US. The average annual premium is $865 per year. Since the vehicle is owned by you and someone else, they need to be listed on the policy as well as an "additional interest." If they don't drive the vehicle, they don't need to be listed as a covered driver. For more information on car insurance without a license, see our guide here.