Love

This explains the relationship mechanic of the game, "Tomodachi Life."

Love (In General)
As it says, Miis can become friends, fall in love, marry each other, move in a house together, and then have a Mii baby! It will all start when a mii has a heart icon out the window. They will then say they have feelings for someone. It's your job to help with the confession, and, if all goes well, proposal!