So pretend Nico leaves after the war and all the other characters have grown up and have 1-3 kids. The photo is just cute no purpose. This is not a Mortals meet Demigods either just a extremely weird idea the some people may find disturbing.

Nicos pov

As I shadow traveled to New York with my triplets, Nicolas, Diana and Angelina. Like I said, weird the thing is, I didn't name 'em and I still don't understand how they came to be. After the war when I ran away I went to Olympus and worked for them, and Aphrodite decided to make all the maiden goddesses fall in love with me and...poof! Three brain kids of Artemis, Athena, and Hestia.
Nicolas is the son of Athena, and he is like me. He hides in the shadows reading books ALL the time. Sometimes Athena would check up on him while I was doing a job for Olympus. Athena has become wary around me because of Aphrodite but we eventually got over it and became friends. Nicolas has messy untamed ebony black hair and dark stormy grey eyes that can peer into the soul. All my kids can shape shift into a animal and he can become a panther. As far as friends he has some Nymphs and minor gods, but by far Hermes is his best friend.
Diana, on the other hand is a complete mess-up she is the daughter of Artemis and she has a ton of man-hating followers...so get the picture. I almost died, but was saved when Artemis took pity and told them what Aphrodite did. Anyway Diana has Ebony black hair, and silver eyes. She is so headstrong that it is almost impossible to get her to back down from a challenge. The funny thing is she can turn into a doe. So she sometimes sneaks off to he mothers camp to have fun and hang out with her hunter friends. She also likes to hangout with forest nymphs and dryads. But her best friends are Thalia and Demeter. Which is quite odd considering I'm her father.
Angelina is a angel. She is the daughter of Hestia, and is super sweet. She likes everyone and loves to play with dryads and naiads. Angelina can turn into a Phoenix and loves to turn into one when we are camping claiming 'I keep the camp bright' but we all know she just likes to play in the fire pit. Angelina has dark brown hair, and warm brown eyes that are so welcoming that no one can resist saying aww. Little Angel can become friends with anyone, and everyone, even Hades and Ares have a soft spot for her. I my head I believe that I made the cutest little thing ever. Hestia and I were already friends so Hestia didn't care that much about the 'incident' so she's cool.
As soon as I saw the familiar landscape of Camp Half-Blood my heart seized up. What is going to happen? I thought crossing the border with my kids. Oh I forgot they are seven years old, and only Thalia knows about them.
I saw the boy on border patrol and I thought to myself Wow, this place really hasn't changed
"Who are you?!" he shouted
"An old ally! Go tell Chiron to call a counselor meeting!" I yelled back. And he raced off.
"Daddy, when do we meet Uncle Leo?" Angelina asked sweetly
"Soon Angel, soon" and we started down the hill.

If someone wants to adopt the idea you can, just pm me.