Here’s a cautionary story about a woman charged with elder abuse in central Virginia. But the woman charged was herself 72, and the abused relative, 97, was not a parent. And this was a case of neglect or inaction. The extreme ages of the persons in different generations are remarkable but this is becoming more common with longer lifespans. People in their 70s can be caring for parents of people of their parents' generation and find this overwhelming.
These sorts of interventions by an adult protective services are infrequent, but the tale is a warning, about leaving an adult with dementia alone.