Robert is pretty sure that the couple in Southern California who were recently found to have kept 13 of their children shackled and starving in a fetid suburban house are, in fact, worse parents than he is.  The Pierces never shackle. Hmm.  Are manacles the same as shackles? A subset?

http://www.latimes.com/local/lanow/la-me-ln-perris-children-shackled-20180115-story.html#nt=inbody-1