> Relatives of the President / Prime Minister also have influence on the government.
Not necessarily, in a properly working system it wouldn't happen. When it does happen, it's a sign that the elected official isn't up to par, which in turn, is a sign that the pool of candidates wasn't either. And guess who exerts the most influence on selecting the candidates and electing the leaders - it's not their relatives.
Follow the money, first and foremost - any deviation from that leads to errors and waste of time.
Because nobody votes for billionaires. They don't have to follow ethics standards like elected officials do. They are free to make decisions that selectively benefit their family or friends (as long as they don't screw over their own shareholders).
Not necessarily, in a properly working system it wouldn't happen. When it does happen, it's a sign that the elected official isn't up to par, which in turn, is a sign that the pool of candidates wasn't either. And guess who exerts the most influence on selecting the candidates and electing the leaders - it's not their relatives.
Follow the money, first and foremost - any deviation from that leads to errors and waste of time.