This is a challenge that will surely make your life in the game, Sims 4, a lot better. Do you not like the people in the Sims world, and if you made the game you would have changed the NPC family's? I know I would! Then it's a must you do this challenge!
It's really your choice :P
Full House, this mod allows you to have more than 8 sims in a household.
First off, you must only make one sim! (This is extremely important)
Next find a NPC sim that you like.
Then be at the point in the relationship, with the sim, where you can ask to move in.
Add the whole entire family to your household.
This is where you can earn some money and sell all lot furnishings.
Kill his or her family and only keep the sim that you had liked before. (Note you can kill all of them if there is a household where you don't like anyone in it, or you can keep more than one if you like one of their family members)
Do this over and over again until all the households is gone, and you have a household that contains everyone you like.
This is where the legacy comes in, build a new world of the children of those sims, once everyone in your household dies, you make a new one sim household and restart the challenge with the new community. Restart as many times as you would like.
There is not really a ending but here's a end goal, woohoo with the grim reaper with the original sim only
You can stop the challenge any time you want, and play so rich because you sold all those lot furnishings!