Grandparents don't have any rights. However you can notifly CPS and file a report against him and tell them what your granddaughter has told you. They will go to the home and investagate. These are very serious alligations and the courts can place the child in your home or a family members home until this has been resolved. They will talk with the child and there are ways that they can get to the truth without the child being aware or afraid. Do this ASAP for your grandaughters sake.


