If you are looking to add a Sim to your home in The Sims 4, there are four methods you can use. Much like real life, The Sims 4 lets you add a potential roommate or a romantic partner to your household if you meet the requirements. There are many reasons for a player to add a Sim to their household, but the most common ones include having a friend as a roommate/housemate or partners wanting to have a child. Needless to say, when you add a Sim to your household, there are many new and engaging scenarios you will experience.