Instructions
Raise the relationship level between a child and one of his parents to the level of "Best Friends." You can do this performing actions between the two Sims, such as talking, hugging or watching television together. As the Sims perform the interactions together, their relationship level will increase.
Click on the child while controlling the adult or vice-versa. A standard interaction series of bubbles will appear around the Sim.
Click "Friendly" from the list of options. Any performable action between the two Sims that is considered "Friendly" will be listed in the bubbles surrounding the Sim.
Click "Family Kiss" to have the Sim kid kiss his parent.