This is new. What now?

Not sure if this is right place to post..

27, married to husband, triad relationship

About 2 years ago I met a gal in a mobile game and we got to talking. We talked (text more so) almost every day, off and on all day. Nothing to serious. Best of friends. We talked about her moving up to where my husband and I are. This past November we drove down, got a moving truck and moved her in with us. Husband and I had been considering adding a third person into our bedroom activities. My friend just fit right in. We don't really consider her an "extra", she's really just another piece of our family. Took a while to adjust mentally for me. I always felt I was to tomboyish to be a girl, but not really a guy. Some where in the middle. I just came to accept it. Now there's a whole new concept for me to process. I never considered myself bi but it just feels right. I love them both. I finally understand who I am and why I've always felt like nothing was right. But here comes the problem: poly relationship are not widely accepted. I love my husband and my girl (still not sure the right terminology). Nothing is going to change that. But how do I explain it to others when they find out? How do I explain this to my daughter? When do I explain this to my daughter? She's only 4..