my aunt had a will and after her death only her husband has seen it...the will says I am to have my grandmothers ranch...what do i need to do?

You could file in the probate court where your aunt lived to be appointed executor of her estate and, as part of the filing, state that you believe she left a Will but her husband has not filed it yet.  I don't understand how you know the Will leaves the ranch to you if only her husband has seen it, but the court has the authority to require him to file the Will.