About MDI forms

Question

Please help me on this.

I have 3 forms on my project.

form1 is mdi controler
form2 and form3 is mdi child

the first question is how do i create form1 as parent and form2 and form3 as children.

and the second question

imagine form2 is open is the parent (form 1),and form 2 has a button if clicked it must open form3 in the parent form(form1).

please help me i'm stuck with this

i have no idea how to write a cord to this please some one help..........


thank u.