I married into a family that has one. My BIL is a moron and MIL makes special concessions for him constantly from paying for attorneys to acting as his own personal driver. Oh, and she raised his son because both parents were morons. The son is now a grown up moron with no job and no ambition (I attribute that to a ton of concessions from MIL). If he could get a degree in alcohol consumption and smoking weed, he would have graduated summa cum-laude.