I have an ongoing save that's been played 7 weeks in and has produced a lot of townie children thanks to MCCC. Here are the ones so far (at least I think I got them all!) that come from two original Maxis sims and have aged to at least child. There are a bunch more toddlers, but I'd rather wait and grab pictures of them when they're older.
Here's a pairing we've probably all seen have kids at one point, the Landgraabs. Before kicking off, Nancy and Geoffrey had two more sons, Gino (teen now) and Marc (a child).
Another classic pairing, Bob and Eliza Pancakes. They have two children, but one is still a baby. The older one, Brian Pancakes, is now a child.
From good old Willow Creek, Alice Spencer-Kim and Eric Lewis had another daughter, Kacey Lewis.
Back over in Oasis Springs, Holly Alto moved in with her husband, Raul Chopra, but it turns out her daughter, Silvia Alto, that lives with them was Holly's from a previous fling with Evergreen Harbor's Jeb Harris.
In Strangerville, Ted and Meredith Roswell had a daughter, Aili Roswell, who is a teen now.
Katrina Caliente ditched Don and married Windenburg's Marcus Flex, who treated her right. They got married and had a son, Giancarlo Flex.
Despite hating children, San Myshuno's Lily Feng had three of them with her husband Victor. First, twins Anika and Cole, now teens, and then another son, Jimmie, who is a child.
Emilia Ernest and Darrel Charm continued their spellcaster bloodlines with a son, Channing Ernest.
Over in Sulani, Leila Illes and Oliana Ngata had a set of biological twins together, which I didn't even realize MCCC could do, which is cool. Here are Alton and Rachael Ngata.
Also in Sulani, Lilliana and Makoa Kealoha had a son, Joshua Kealoha.
In Del Sol Valley, Octavia Moon and Thorne Bailey had a daughter, Brittani Bailey-Moon.
In Mt. Komorebi, Jenna and Kado Akiyama had another daughter, Lea.
And last but not least, over in Windenburg again, Candy Behr had a son with Sulani's Duane Talla before marrying Malcolm Landgraab, who she hasn't had any children with yet. This is Kellen Behr.
Like I said earlier, this file also has a ton of toddlers, so hopefully in the future I will have more updates to pass along!