That seems a little over the top to me. There is no indication whatsoever that Sandusky's wife has ever watched him rape a child, and to go ahead and extrapolate that out to her own grandchildren is quite some imagination.
The ex-DIL is wise to keep her children away from Sandusky the elder, though. He has been cut-off from his 'regulars', so he will be looking to have sex with anything young. Perverts like that don't change.
“.. there is no indication whatsoever that Sandusky’s wife has ever watched him rape a child...”
Someone doesn’t have to hold a child down to be raped in order to assist the rapist. Mrs. Sandusky was present in the family home when foster children and some boys from the Second Mile Foundation were raped in the basement. No one is going to tell me that a woman, whose own husband referred to her as “Sarge” of the home, didn’t notice body fluids on the sheets. I can’t believe any real Mom wouldn’t notice something in the children’s eyes the next morning. I am afraid that if you knew a foster son was being brutalized.. nothing prevents her five year old grandson from such brutality. In a case like this... I would personally side on the safety of the children. The risk is just too darn high IMHO.