When your family is together, pause the game and hold RT+RB and LT+LB. A screen will come up saying that Spoot the magic Llama has appeared in your catalog under decor miscellaneous. After activating the cheat, you will not be able to unlock any trophies/challenges, but you will be able to save the game right before activating the cheat. It is worth it, with it, you will be able to max out karma, use the infamous motherload/kaching cheats and give yourself 5,000 lifetime happiness points. This cheat also act as a lesser version of testing cheats enabled. by holding LT and click on a sim you will have the option to either trigger age transition or add sim to active family. If you hold LT and click on a mailbox you will be able to make all happy, make needs static, Force Visitor, Force NPC, Make friends, possible, ect. Remember to save a copy of your game.
Hold down L1, L2, R1, and R2 at the pause menu at the same time and a screen shows up asking you if you want to enable cheats with a warning that challenges and trophies will be disabled if cheats are enabled. If you pick yes you will read that an item named "Spoot the Magic Llama is in your buy catalog. You must get him to enable cheats. He is located under "Miscellaneous Decor." If you buy him you can set him down somewhere or put him in your inventory. When you do click on him it gives you various cheats to use including: Motherlode, Unlock Karma Powers, ect.