Kyuuri

Hosik's Secret and Love is an Illusion are both very good ones with very cute kids :] i would also reccomend blood link although the child doesn't come in until around chapter 55 to 60

this topic screams omegaverse but i'm here to see if adoption mangas exist

Not sure if this fits the description but here.
Koishite Daddy
Patchwork (fujitani Youko) -Sadly, it's a oneshot
Kazoku Ni Narouyo

These are omegaverse.
Kiraide Isasete
Tadaima, Okaeri

Family and children : http://www.mangago.me/home/mangalist/319075/

Novel (my favorite is My Wangfei is a Man) https://www.wattpad.com/story/185164584-my-wangfei-is-a-man-completed

Wow thanks!! Can you recommend some more novels??

Thank you , I’ve read all of them

Yup! Give me a little bit of time to compile my list and I will send them your way!

Yes ! Thank you （╹◡╹）♡

Anytime!

http://www.mangago.me/tag/Unrequited+Love/