Were is the muller company?

Yes...owned by the family.

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

Yes.

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...

yup a public company is very much different from a govt. company,in a govt. company 51%of the share is held by central govt. or state govt. and remaining 49%is held by other joint ventres or even by...