Hello. My wife and I finally feel like it is time to expand our family by meeting a new woman for us to love. I am hoping that we can find good advice on meeting people, or actually meet someone here to expand our family with. It is almost impossible to find a single bisexual woman, even on dating sites, and we have tried a lot of them. So, any advice or anything else would be awesome.
You're looking for a unicorn. She is so rare, she is a myth.
FMF triads are almost non-existent. After all, what's in it for a single bi woman? Maybe some fun sex, for a while. There is stigma in polyamory. She'd be perceived as the other woman, a home wrecker, by many in our society. Or the three of you couldn't be "out" to anyone you know. She'd be passed off as a friend or roommate. She would be secondary.
If you want someone to live with you, "expand your family," you could never marry her. That's illegal. She would need her own room, her own ability to nest and decorate the home with her personal style. She would need special legal steps taken to protect her for her well being as the non-married partner.
There's an excellent chance one or the other of you would love her less, or never fall in love with her, or fall out of love, leading to awkwardness. Or she might only love one of you, and just like the other. Then you'd have a V, where one partner is a hinge, and the other 2 are not romantically involved.
Mainstream media paints these so called FMF triads as THE way to do polyamory. But that is because this kind of arrangement SELLS. It's the top fantasy for men, to have 2 women in bed. And if he can watch them do lesbian sex together, all the better.
But the truth is, the huge majority of poly couples date separately. Each partner finds and dates their own other partner. Say, you find another woman to date. This woman may or may not get along with your wife. They may not like each other and prefer not to meet. They may like each other a little, and be OK saying hi if their paths cross. They may like each other enough to hang out if you're there. They may like each other enough to hang out if you're not there. They may be sexually attracted to each other for a while, but not really like each other as people.
Each of these scenarios is much much more likely than the one where all 3 of you like, love and are attracted to each other equally and you end up in a lifelong equal relationship.
By the way, this unicorn wouldn't "expand your family." You and your wife's old relationship would be over. A triad is several Vs stacked up.
You+wife
You+unicorn
Wife+unicorn
Each dyad is its own relationship. Each one needs nurturing separately. Then the whole threesome needs to be balanced and operating well also.