Yes, in actuality, while you are a beneficiary and executor, her blood cousins are actually considered her true next of kin pursuant to traditional intestate laws and probate laws. If you are the executor, you have a duty to contact them to inform them she passed and indicate they are listed as beneficiaries in the will.  Depending on the will's provisions, if the cousin or cousins choose to challenge the will (for example, they want more or your share), and the provisions call for it, then they may be out of luck entirely if they challenge it. Once you successfully contact them and explain the next steps, you need to make sure the transition of your aunt's bequests to them will be complete.