Keep in mind that if they don't swim often in a pool or an open body of water, they will turn into regular human sims.

If you wish to marry in a mermaid, you are restricted from doing so until Medical is cleared due to the impossibility of keeping them alive without access to a shower or bathtub.

ONLY ghosts can marry in other ghosts at will from the start of the challenge.

If you are playing any supernatural type OTHER than ghosts, you may not marry in a ghost until Paranormal restrictions have been lifted.

You may marry any sim of any supernatural persuasion with the following exceptions.

If you fail to lift hopelessness, marry in a spouse and at least have an heir on the way before your founder becomes uncontrollable, you lose the challenge.

You have 8 weeks and 4 days before you must move the founder out of the household regardless of restrictions cleared.

You have 6 weeks and 4 days before your founder becomes senile and uncontrollable.

If you have started the challenge with a supernatural sim who's lifespan exceeds 90 days.

The following rules govern how to introduce supernatural sims to your household, what supers you may start a challenge with and what to do if you create a founder or marry a supernatural in that has a longer lifespan than 90 days.

Seasons, University Life and Island Paradise each added a supernatural type as well, bringing the total number of non-human playable sim types to 8. The Late Night and Supernatural expansions for The Sims 3 brought us the ability to play vampires and other supernatural beings.

The sims 3 sobrenatural