Good afternoon Donna,
I'm Doug, and I'm very sorry to hear of your family's situation. My goal is to provide you with excellent service today. I've not only been an attorney for more than 30 years but I am also a former law enforcement officer.
Given that the child was not immediately taken to the hospital or doctor and there is no indication of physical injury, and based on the way that the detective is talking, I must presume that there is an excellent chance that the baby sitter told the police that the father sexually molested your granddaughter.
Because this is an ongoing criminal investigation the police are under no legal obligation to explain to the father the nature of the investigation, and no way for his attorney to find out either.
The police do not have the legal ability to tell the father to stay away from his child and so I must also presume that children's services is likely involved and they do have the ability to prevent him from seeing his daughter.
You asked: It's in a different parish so if we went to the courthouse where it was filed could we find out. There would be nothing filed at the courthouse unless and until the police choose to file criminal charges. This is still apparently early 9in the investigation stage and the court will not be immediately involved.
You wrote that the detective lead him to assume it was not anything to do with him. I think that was to throw the father off the track---it was essentially just a lie. Police generally have absolutely no problem with advising parents of an ongoing criminal investigation involving their own child unless the parent is either a person of interest or a suspect. The fact that he was told that he can't see his child is a huge red flag telling me that he is at minimum a person of interest in this crime---but more likely than not, an actual suspect at this point.
You may reply back to me using the Reply link and I will be happy to continue to assist you until I am able to address your concerns, to your satisfaction.
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I wish you and yours the best in 2016,