Brotherly and sisterly love can take an unfriendly family turn when sibling double standards come into play. Parents are supposed to love and treat all of their kids the same, right? Well, in some cases, parents may show a preference for one child over another.
Double standards, which often manifest in stricter rules for one child that don't extend to siblings, might result from changing times and expectations. Whatever the reason, some kids could harbor resentment because of such double standards.