In the cheat menu (ctrl+c) enter "moveObjects on"
Chat with our AI personalities
your other sims that you made have to be in a high relationship with the "ready-made sims" (NPC's) They have to be at least best friends or something like that, click on them and click on "propose..." then click on "move in" they will hug your sim if they have accsepted. Either that or you can click "propose..." then "engagement" then after your sim marries them, they will move into your sims house.
Build a friendship between the two sims & then eventually it should have "Propose.." "Move In" in that pie bar when you click on another sim.
All you need to so is get a good relationship with the Sim you want to move into your house and then just click on the Sim then on the option propose then move in.
You do this by making the sim you want to get rid of move. But when you move it tick the box which says kick out, that will get rid f the sim from your sim family.
There is a cheat but I don't know it. Basically you have to make your sims fall in love (get their life-time relationship above 60) and then you can 'Propose' 'Move In'. The other sim may say no, if they do, you have to get their life-time relationship up even higher and try again. Or you can go to the neighbourhood and move a sim from the family bin into the same house as another sim.