Unity3d | how to create a child object with a script?

Question

C++ / C#

There is an object, it is necessary that when the button was pressed, it would be created (instantiate) child to another object. (Do not throw links to documentation and Google)

Answer 1

Read the documentation about instantiate. Everything is written there.

Answer 2

Do you have a problem with what exactly? With a button click event? With object creation? With the "childhood" of the object?