When you propose to a woman who has children, you aren't just marrying her - you're marrying her kids, too. That's why when this man got engaged to this little girl's mother, he wanted her to feel included.
"Do you want to be my daughter forever?" he asks, as he pulls out a child-sized ring.
She puts it on and excitedly screams, "It fits!"
H/T: Poke My Heart