Need for Help

Hi, i got a few questions.

First some infos to myself. Im A-Romantic Straigt male and Married. My Wife is Bi-Intrested and Poly. She is in Love with a friend of her. We know that her friend is Bi and maybe Intrested ( both of us really cant "see" flirting). she allready told us she is Poly but her Boyfriend dont want it. He is against LGBT .Im totaly fine with the Idea of a Poly Relationship. I love to see them interact (non-sexual), its make them very happy. And this makes me happy and i think i like her too.

Now my questions.

1. Should my wife tell her friend that she is in love with her?

2. How does Polyfidelity work?

3. My wife and i have a daugther together. How does a Polyfidelity Relationship affect her?

4. What are the biggest problems in this form of relationship

After all im a curios about this situation and how i can help them.

Sry for the english mistakes, greedings from Germany