Alright so, I realize I am VERY late to reply, and I realize this was about daughters (not sons), but...
Had my first son the other day. A spiritual mentor of ours was present, and we had a time of prophetic prayer for little Aiden. This mentor, who knows nothing about our situation or poly or whatever, had a vision of my son walking hand in hand down an aisle with two women he was 'connected to'. I felt an immense swell of gratitude and praise that God would like to bless my little boy, who isn't even a month old yet, with multiple wives.
Is this hard? Of course it is! Does my situation suck right now, with my first wife not really being on board and being upset by it, and not living together with my second? OF COURSE IT SUCKS. It sucks big. But still, when the thought came of my son having multiple wives during the prayer, I felt only joy and excitement for him. May he be blessed and God enlarge his house!
To my shock, when discussing this with my first wife later, she was unhappy, and although she knew that was what God meant, she didn't want to believe it. At first I couldn't believe she would be so selfish as to withold that from our son (in her heart) because of her own feelings in our experience. But surprisingly, her answer was that she didn't want Aiden to go through the ostracization or upset of society/family/friends/etc.
I honestly cannot sympathize with that feeling, and am kind of surprised at how many of you seem to feel the same way! Not a criticism, I'm just surprised. Do we REALLY value the shitty, hurtful, close-minded society we live in that much, that we would be distressed more by that than excited for our children to experience the fullness of God's blessings?
I really don't mean this in a preachy way, maybe I'm just not experienced-enough a dad yet, but...I don't get it. I feel nothing but joy that God may bless my son with multiple wives, and am already praying for him and them