Like a frenemy, clandits will pose to be your friend and a good member of the family, but not act like one in many situations.
A clandit can also be someone in your family that steals from you.
2a) A cousin is house sitting for you. While you are away, the cousin "borrows" the car and doesn't return it.
2b) When someone in the family dies and an inheritance is left, the clandit will contest the will in an effort to get more than their fair share of the inheritance.