Thread class in many form

hi everyone;
i have 2 forms are mainform ,and form1 is a child form of mainform,
when I press a button on mainform ,it will open form1,
i have write a thread class (name is a mythread) ,I use this thread in both 2 form above.
how I want when press a button on mainform ,it open form1 ,but value from mythread is only emit to form1 ,but not in mainform.

That description is way to vague, can you show how you instantiate the form and thread objects?

Cheers,
_