Button up for her sister

We were at church, and I saw Campbell was trying to button up Imogen's jacket, and I was just watching them. 

Campbell was doing really good, and even when Imogen was trying to run away from her, Campbell started entertaining Imogen to hold her down saying peek-a-boo, peek-a-boo. 

Imogen sat down again, and she let Campbell finish it. 

What a sweet moment!!!