Hi @Wingingitlife
I read your post and it touched me deeply. I'm a young man, older than your eldest son, and my mom is going through a situation very similar to yours.
I'm an only child. My biological father sadly passed away, and when my mom met her current partner, I want to be completely honest with you: at first, I didn't accept him, not at all. It was an incredibly hard period for me, full of anger and confusion. But he never gave up. He was patient, affectionate, present in my life in a way I never could have imagined. And over the years, he became, in every way, my second father, even though I refused to accept him.
He is younger than my mom and doesn't have children of his own. Now he deeply wishes to have a child with her, his first child, and they are trying. I'm writing to you because I want you to know just how incredibly emotional this journey is for us children too. After a lifetime as an only child, when I found out in February that my mom was pregnant, at first I was shaken, I didn't even know what to feel. It was a shock, I admit it. Then, unfortunately, she lost the baby shortly after. But today, looking back on everything, the thought and the hope that my mom might succeed fills me with excitement.
Today, the idea of seeing that man who has given me so much become a father through my mom helps me see him with different, more familiar eyes.
From the perspective of a "grown son," I want to confess something to you in silence: what you and your partner are building is something precious and beautiful. I'm certain that your children will be thrilled and will support you with all their hearts, just as I am trying to do now with my mom and with the man who welcomed me as his own son.
And I'll tell you more: I believe that having a child with him could be the key for your kids. It will help them see him with completely new eyes, to fully welcome him as a father, as the paternal figure he already is. That's how it was for me.
Please, don't lose hope, not even for a second. You have a wonderful family and your partner seems like a man with a rare heart. I'm sending you all my love, and I hope with all my soul that your dream comes true very, very soon.
A big hug