My son through me for a loop

I have not posted about my son in a long time and it's not because anything bad happened. A few years ago I started posting about him and he was just my step son. He put us through hell, with the drinking and drugs and trying to kill himself. He also stole from us and was very disrespectful. His mom was shit. She allowed random men in the house who sexually abused him and he was sexually abused so bad to the point he ended up in the hospital when he was 10. Our relationship was not great at first but as I started to advocate for my husband getting him therapy and showing him I cared just as much about him as his little brother. I was pregnant at the time and we built a strong relationship. We watched movies together and his favorite is brother bear. I legally adopted him when he was 17 a month after having my son. And now that my son is walking, whenever he sees his brother come home from school (community college) he runs towards him and it's so cute. He's an amazing big brother and I knew he would be because his trauma gave him a soft spot for kids. He told me everything. When he had consensual sex for the first time he told me. He came out as bisexual to me and then came out as pansexual. My husband was honestly kind of jealous how close we were. My son has a partner who is biologically female but identifies as nonbinary and takes testosterone and looks more masculine. Btw plz keep comments positive and nothing negative. They're really sweet and are good to him and he's good to them. His partner has a child from a previous relationship who's 2 and calls them Papa. My son and his partner want to move in together and I knew I was gonna miss him when he moved out. But after school he said he needed to tell me and his father something and he was trying not to laugh. He's also about to be 19. But he said "Soooooo..... I'm gonna be a dad". I about had a heart attack. My husband did lmao. I said "I thought your partner was on testosterone?" And he said "Yeahhh they wasn't able to get thier shot at one point and some point between then and when they could get their shot, baby got conceived". I asked was he still planning to finish school and he said yes and I jumped up and said "CONGRATULATIONS!!!" My husband still needed a minute for it to sink in. I asked was baby shower gonna be brother bear themed and he said "You know it!" See I remember him telling me he didn't think he would have kids because he thought no one would want him because of how "nasty" and "used" his body was. And he's gonna be a dad! He picked up his baby brother and said he's gonna be an uncle.

Fuck... It just sunk in... I'm gonna be a grandmother with a toddler.... Omg....

Oh and he's also planning on adopting his partners son since their bio dad is trash. But I'm so happy for him and how far he's come.