In Richard III family is not the lovey-dovey stuff of The Simpsons' Flanders family. After all, we're talking about a family that was at each others' throats for a good 30 years. The play takes domestic backstabbing, treachery, and murder to a whole new level. The worst offender, of course, is Richard, who has his brother murdered, hires a hit man to snuff out his nephews, and manages to turn his own mother against him. (And these are just warm-up exercises.) Although Richard embodies the horrors of family violence, very few characters in this play are innocent.
Richard is the embodiment of familial violence.
Family matters are inextricable from political affairs in Richard III.