Dis saw her two sons playing together in the halls. Since Fili was now seven and Kili was two, she somewhat thought he was old enough to be looking after his little brother. Mostly after Thorin talked her into believing that so she wouldn't have to be worrying when she would do other things.

Fíli grabbed both of Kili's hands, slowly raising him up to his feet. He let go, taking a few steps back.
"Come on, Kili! Walk to me!" Said Fili with a smile on his face.

"Fi...li" Kili looked as if he was about to cry as he clung onto the wall next to him. "Don't be scared, Kili. Just walk to me."

Kili crouched down back down, sitting onto the floor.

Suddenly, a light bulb went off in Fili's head. He knew exactly how he would get his brother to walk. Like all children, Kili had his favorite toy. Fili had a lion and Kili had a wolf.
Putting the wolf in his pocket, Fili grabbed Kili's hands, making him stand up again. Then he took a few steps back and took out the small toy.
"Come, Kili. Walk towards me."

Upon seeing his favorite toy, Kili revealed a large grin on his face, extending his arms as he made slow, wobbly steps towards his brother, successfully grabbing the toy and sticking it in his mouth. Dis worried Kili was about to fall and made her way to her son but Thorin laid a hand on her shoulder. A smiled formed on both Thorin and Dis's lips, seeing what had just occurred in front of them.

"Ma! Kili just walked!" Fili shouted excitedly.

"You are such a good brother, Fili." She stated as she placed a kiss on both their foreheads. "And great kings they will make." Thorin agreed.