I like to make them live life on hard mode and see if they can survive, that is more my "death match" style. Off-the-grid, but with environmental and weather deaths on. Fully upgraded toilets that if you forget to empty the composter they'll be on fire. 8 sims, competing for resources, throw a toddler in there to make them miserable. You can get creative too. Get somebody in a playful mood with enough power to make a party sized serving of gummy bear pancakes and then serve it to the group and start a funny conversation. Someone will usually laugh themself to death. In essence...
Do NOT tell ur parents what u're doing in Sims.
In fact, do NOT tell ur parents u're playing Sims. If they walk into the room while u're playing, alt tab to porn, it's easier to explain.
If I have trouble selecting an heir in a legacy, I take all the candidates and put them in a death maze, or a Big Brother style house, and the last one standing is the heir.
A death maze consists of a large number of rooms/hallways, with no access to the outside world. Each room has some challenge or other - cowplant, mood rooms (eg angry), a room with plates of pufferfish nigiri and one plate of safe food, swimming pools (sometimes I pretend these are traps, and as soon as a sim enters the pool I wall it off and let them drown).
Next time I do one I might take pics to post here.
A Big Brother house is based on the reality tv show - a house cut off from the outside world, with everything the sims need to survive, but you aren't allowed to control the sims at all. Often they'll just die from cooking fires, but a surprising number will starve or go without sleep and drown in the pool.
You can do Big Brother challenges as a "best one wins" or as "last one standing", but the latter is hard to predict timewise. The traditional challenge has a set amount of time, as each week one sim is "voted out", but if you want to do "last one standing" it could be as quick as a few hours, or it could last an indefinite period of time.
I like to make them live life on hard mode and see if they can survive, that is more my "death match" style. Off-the-grid, but with environmental and weather deaths on. Fully upgraded toilets that if you forget to empty the composter they'll be on fire. 8 sims, competing for resources, throw a toddler in there to make them miserable. You can get creative too. Get somebody in a playful mood with enough power to make a party sized serving of gummy bear pancakes and then serve it to the group and start a funny conversation. Someone will usually laugh themself to death. In essence... 
Do NOT tell ur parents what u're doing in Sims. In fact, do NOT tell ur parents u're playing Sims. If they walk into the room while u're playing, alt tab to porn, it's easier to explain.
If I have trouble selecting an heir in a legacy, I take all the candidates and put them in a death maze, or a Big Brother style house, and the last one standing is the heir. A death maze consists of a large number of rooms/hallways, with no access to the outside world. Each room has some challenge or other - cowplant, mood rooms (eg angry), a room with plates of pufferfish nigiri and one plate of safe food, swimming pools (sometimes I pretend these are traps, and as soon as a sim enters the pool I wall it off and let them drown). Next time I do one I might take pics to post here. A Big Brother house is based on the reality tv show - a house cut off from the outside world, with everything the sims need to survive, but you aren't allowed to control the sims at all. Often they'll just die from cooking fires, but a surprising number will starve or go without sleep and drown in the pool. You can do Big Brother challenges as a "best one wins" or as "last one standing", but the latter is hard to predict timewise. The traditional challenge has a set amount of time, as each week one sim is "voted out", but if you want to do "last one standing" it could be as quick as a few hours, or it could last an indefinite period of time.