Who is the father of DOS?

Bill Gates owns DOS, (DISK OPERATING SYSTEM) which is used in most products involving a computer/laptop, Apple products use DOS mainframes but they are edited to fit the Apple product, Windows is technically the founder and owner of DOS as Bill Gates has now signed over his ownership to his children, so he doesnt technically own DOS or Microsoft and Windows anymore.

So Bill Gates' children own DOS but i arent sure who made DOS