While I think an initial reaction of denial in the face of this horror is real and normal, that is usually expressed as shock and disbelief. I think what this grandparent said was "I don't believe it, I want to talk to them (the children) and get the real story". That statement reeks more of denying the abuse that the survivors have experienced ever happened. It likely speaks to the family dynamics in LT/DT's families of origin.
Also, while the media can certainly be voracious and vulture like in their appetite which is unseemly, I disagree entirely with the the concept that these relatives should just discount what is on the "news" as if it is fiction. The News is reporting the words of the D.A. , so if we support and believe the D.A., then I guess we support the regurgitation of the D.A.'s words to the press. Words that are coming straight from the narratives of the victims and the impressions from the LE at scene of the crime.
I think initial denial would give way to the facts and to feelings of horror of what your family member has apparently done. Questioning the victims for the "real story" in an attempt to deny what your son or daughter has done is extremely dysfunctional. He can certainly question his son later, NOT the victims narrative.
While I have empathy for their disbelief...victims first. Always.
MOO