What companies diversify?

Dell and Apple are the best computer companies in the world, and lots and lots of people prove that by buying what they make I dont know who answered above -- best is an opinion and what you need it...

A sister company is a company with the same owner while a mother company is the owner

yes...

Yes, in some countries a company can be a director of another company. Hong Kong is one example.However, in other countries a director has to be an individual, and can't be a company. Australia is an...

Yes.