My 3-year-old daughter has a bed-time ritual: read a story, while sitting in the big, cushy rocker, followed by getting tucked into bed with all her snuggly blankets, and her beloved "jammie." Then, it's hugs and kisses, and songs, with lights out, and window blinds open (so the moon can shine through).
One of her favorite songs is the "Happy Family Song." It goes something like this: "I love Daddy, he loves me; we love ___ & ___ & ___ & ___ & ___ & ___ (all the kids, + the dog), yes sirree! They love us, and so you see, we are a happy family." I've tried to change the order of the song around, with her name coupled with mine, first, but she won't let me. She always wants my name coupled with Daddy's. She knows that's the right order of things. Mom + Dad, first, then the kids. If I try and change things around, she always corrects me. She's already figured out that her safety, happiness, and Peace On Earth are founded on "I Love Daddy, He Loves Me," followed by the kids.
Mommy + Daddy (foundation) + kids = Happy Family
So simple, even a 3-yr.-old knows.