Todomomo

Momo talks to Rei about girls and teases her about liking someone. (Like how friends tease girls when they have a crush)
With August, they cook with him, or have tea parties.
They go outside and run around with them. Momo is not a fan of dirt so she'll dance with them, but that's it.
They bond with Eve by feeding her. She's a chubby baby.

Kirimina

They play Just Dance with Akane. They teach both twins how to rollerblade and have races.

Miruhawks

They watch her color and praise her. Like she's being a happy child and coloring on the ground, then her parents lay down and Dove is like

Iidamei

The entire family works on a car together.

Kamijirou

Jamming out together.

Dabi x toga

I think Toga probably got arrested after their son was born, so Dabi and Roman go outside and burn things like leaves.

Nejitama

Amai likes skateboarding so Nejire learned how to do it. They skateboard around now.

With Phoenix, they color with him.

Mt.Kamui

Gardening. It's amazing for them.

Ryushot

They watch anime together. Doesn't even have to be family friendly. Just cover the kids' eyes while Tanjirou beheads Mother Spider Demon.

Reiko x Shinsou

They watch Rosalind throw fashion shows. Reiko is halfway asleep, Shinsou is petting the cat very creepily, Rosalind is having the time of her life.