@superkyle221
If your Sims is played, and you marked them unplayed, it then depends on if they are housed on not. If they are housed, they won't be culled. If they aren't housed, they may at some point, though if they are relatives of your played Sims, they will be rather low on the list. Your best bet if you want to be sure they aren't culled is to put them in a house, that will make them immune.
If you want Sims to be picked as fitness instructor, etc, they need to be unplayed. Other than that there are various constraints on traits for example, so your Sims need to fit the criteria to be picked. The criteria depend on the job, so it's a bit hard to predict if they will be picked or not.
